diff --git a/dephy-vending_machine-examples/.github/dockerfiles/dephy-vending-machine-examples.dockerfile b/dephy-vending_machine-examples/.github/dockerfiles/dephy-vending-machine-examples.dockerfile
new file mode 100644
index 0000000..6481442
--- /dev/null
+++ b/dephy-vending_machine-examples/.github/dockerfiles/dephy-vending-machine-examples.dockerfile
@@ -0,0 +1,14 @@
+FROM alpine:3.21
+
+ARG TARGETPLATFORM
+
+ENV RUST_LOG=info
+
+WORKDIR /opt/dephy-vending-machine-examples
+RUN adduser -D dephy --uid 1573 && chown -R dephy:dephy /opt/dephy-vending-machine-examples
+
+COPY ./${TARGETPLATFORM}/dephy-decharge-controller-server /usr/bin/dephy-decharge-controller-server
+COPY ./${TARGETPLATFORM}/dephy-decharge-controller-node /usr/bin/dephy-decharge-controller-node
+COPY ./${TARGETPLATFORM}/dephy-gacha-controller /usr/bin/dephy-gacha-controller
+
+USER dephy
diff --git a/dephy-vending_machine-examples/.github/workflows/build_then_release.yml b/dephy-vending_machine-examples/.github/workflows/build_then_release.yml
new file mode 100644
index 0000000..c3daf76
--- /dev/null
+++ b/dephy-vending_machine-examples/.github/workflows/build_then_release.yml
@@ -0,0 +1,170 @@
+name: Build then release
+
+on:
+  push:
+    tags:
+      - "v*"
+    branches:
+      - "main"
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  gen_version:
+    name: Generate version
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.generated-tag.outputs.tag }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Get latest tag
+        id: get-latest-tag
+        run: |
+          echo "tag=`gh release list -L 1 | cut -f 1`" >> $GITHUB_OUTPUT
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Bump version
+        id: generated-tag
+        uses: actions/github-script@v6
+        with:
+          script: |
+            if (context.ref.startsWith("refs/tags/")) {
+              let tag = context.ref.replace("refs/tags/", "");
+              core.setOutput('tag', tag);
+              console.log(`This event pushed a tag ${tag}, return directly.`)
+              return
+            }
+            console.log('Use default tag "prerelease".')
+            core.setOutput('tag', 'prerelease');
+
+  build:
+    needs: gen_version
+    name: Build
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-apple-darwin
+            runner: macos-latest
+            build_env: {}
+          - target: aarch64-apple-darwin
+            runner: macos-latest
+            build_env: {}
+          - target: x86_64-unknown-linux-musl
+            runner: ubuntu-latest
+            build_env: {}
+          - target: aarch64-unknown-linux-musl
+            runner: ubuntu-latest
+            build_env:
+              CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_RUSTFLAGS: "-Clink-self-contained=yes -Clinker=rust-lld"
+              CC_aarch64_unknown_linux_musl: clang
+              AR_aarch64_unknown_linux_musl: llvm-ar
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup protoc
+        uses: arduino/setup-protoc@v3.0.0
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Install musl-tools
+        if: matrix.runner == 'ubuntu-latest'
+        run: sudo apt update && sudo apt install -y musl-tools
+      - name: Install cross build deps for aarch64-unknown-linux-musl
+        if: matrix.target == 'aarch64-unknown-linux-musl'
+        run: sudo apt update && sudo apt install -y clang llvm gcc-aarch64-linux-gnu
+      - name: Add target
+        run: rustup target add ${{ matrix.target }}
+      - name: Setup rust toolchain
+        run: rustup show
+      - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: build-then-release-${{ matrix.target }}-v1
+      - name: Build
+        env: ${{ matrix.build_env }}
+        run: |
+          cargo build --release --target ${{ matrix.target }}
+      - name: Compress
+        run: |
+          zip -j dephy-decharge-controller-node-${{ needs.gen_version.outputs.version }}-${{ matrix.target }}.zip ./target/${{ matrix.target }}/release/dephy-decharge-controller-node &&
+          zip -j dephy-decharge-controller-server-${{ needs.gen_version.outputs.version }}-${{ matrix.target }}.zip ./target/${{ matrix.target }}/release/dephy-decharge-controller-server &&
+          zip -j dephy-gacha-controller-${{ needs.gen_version.outputs.version }}-${{ matrix.target }}.zip ./target/${{ matrix.target }}/release/dephy-gacha-controller
+      - uses: actions/upload-artifact@v4
+        name: Upload artifacts
+        with:
+          name: dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-${{ matrix.target }}
+          path: "*.zip"
+          retention-days: 1
+
+  release:
+    needs: [gen_version, build]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Generate changelog
+        uses: orhun/git-cliff-action@v3
+        id: git-cliff
+        with:
+          config: cliff.toml
+          args: "-vv --strip header ${{ needs.gen_version.outputs.version == 'prerelease' && '--unreleased' || '--latest' }}"
+      - uses: actions/download-artifact@v4
+      - name: Display fetched artifacts
+        run: ls -R
+      - uses: softprops/action-gh-release@v2.0.6
+        name: Emit a Github Release
+        with:
+          token: "${{ secrets.GITHUB_TOKEN }}"
+          body: "${{ steps.git-cliff.outputs.content }}"
+          tag_name: ${{ needs.gen_version.outputs.version }}
+          prerelease: ${{ needs.gen_version.outputs.version == 'prerelease' }}
+          files: |
+            LICENSE
+            dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-x86_64-apple-darwin/*.zip
+            dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-aarch64-apple-darwin/*.zip
+            dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-x86_64-unknown-linux-musl/*.zip
+            dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-aarch64-unknown-linux-musl/*.zip
+
+  image:
+    needs: [gen_version, build]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: actions/download-artifact@v4
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3.3.0
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5.6.1
+        with:
+          images: ${{ vars.DOCKERHUB_USERNAME }}/dephy-vending-machine-examples
+      - name: Extract all released executable files
+        run: |
+          for dir in dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-*/; do
+            for zip_file in "$dir"*.zip; do
+              [ -f "$zip_file" ] && unzip "$zip_file" -d "$dir" && rm "$zip_file"
+            done
+          done
+      - name: Display fetched artifacts
+        run: ls -R
+      - name: Move directory for platforms
+        run: |
+          mkdir linux &&
+          mv dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-x86_64-unknown-linux-musl linux/amd64 &&
+          mv dephy-vending-machine-examples-${{ needs.gen_version.outputs.version }}-aarch64-unknown-linux-musl linux/arm64
+      - name: Display moved files
+        run: ls -R
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v6.10.0
+        with:
+          file: ./.github/dockerfiles/dephy-vending-machine-examples.dockerfile
+          context: .
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          push: true
diff --git a/dephy-vending_machine-examples/.github/workflows/check_and_test.yml b/dephy-vending_machine-examples/.github/workflows/check_and_test.yml
new file mode 100644
index 0000000..a9755e1
--- /dev/null
+++ b/dephy-vending_machine-examples/.github/workflows/check_and_test.yml
@@ -0,0 +1,40 @@
+name: Check and test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Check and test
+    strategy:
+      matrix:
+        platform: [ubuntu-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup rust toolchain
+        run: |
+          rustup install nightly
+          rustup component add rustfmt --toolchain nightly
+          rustup show
+      - name: Install nextest
+        uses: taiki-e/install-action@nextest
+      - uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: check-and-test-${{ matrix.platform }}-v1
+      - name: Check code format
+        run: cargo +nightly fmt -- --check
+      - name: Check the package for errors
+        run: cargo check --all
+      - name: Lint rust sources
+        run: cargo clippy --all-targets --all-features --tests --benches -- -D warnings
+      - name: Execute rust tests
+        run: cargo nextest run --all-features --no-tests=pass
diff --git a/dephy-vending_machine-examples/.gitignore b/dephy-vending_machine-examples/.gitignore
new file mode 100644
index 0000000..f60c29a
--- /dev/null
+++ b/dephy-vending_machine-examples/.gitignore
@@ -0,0 +1,13 @@
+.env
+.DS_Store
+target
+.anchor
+*.rs.bk
+node_modules
+test-ledger
+.yarn
+bun.lock
+bun.lockb
+package-lock.json
+data
+tmp
diff --git a/dephy-vending_machine-examples/.pre-commit-config.yaml b/dephy-vending_machine-examples/.pre-commit-config.yaml
new file mode 100644
index 0000000..688e9d0
--- /dev/null
+++ b/dephy-vending_machine-examples/.pre-commit-config.yaml
@@ -0,0 +1,54 @@
+fail_fast: false
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: check-case-conflict
+      - id: check-merge-conflict
+      - id: check-symlinks
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: fix-byte-order-marker
+      - id: mixed-line-ending
+      - id: trailing-whitespace
+  - repo: local
+    hooks:
+      - id: taplo
+        name: taplo format
+        description: Format Cargo.toml files with taplo.
+        entry: bash -c 'taplo format --check'
+        language: rust
+        files: Cargo.toml$
+      - id: cargo-fmt
+        name: cargo fmt
+        description: Format files with rustfmt.
+        entry: bash -c 'cargo +nightly fmt -- --check'
+        language: rust
+        files: \.rs$
+      - id: cargo-deny
+        name: cargo deny check
+        description: Check cargo dependencies
+        entry: bash -c 'cargo deny check -d'
+        language: rust
+        files: \.*$
+      - id: typos
+        name: typos
+        description: check typo
+        entry: bash -c 'typos'
+        language: rust
+        files: \.*$
+        pass_filenames: false
+      - id: cargo-check
+        name: cargo check
+        description: Check the package for errors.
+        entry: bash -c 'cargo check --all'
+        language: rust
+        files: \.rs$
+        pass_filenames: false
+      - id: cargo-clippy
+        name: cargo clippy
+        description: Lint rust sources
+        entry: bash -c 'cargo clippy --all-targets --all-features --tests --benches -- -D warnings'
+        language: rust
+        files: \.rs$
+        pass_filenames: false
diff --git a/dephy-vending_machine-examples/.prettierignore b/dephy-vending_machine-examples/.prettierignore
new file mode 100644
index 0000000..1c26229
--- /dev/null
+++ b/dephy-vending_machine-examples/.prettierignore
@@ -0,0 +1,9 @@
+.anchor
+.DS_Store
+target
+node_modules
+dist
+build
+test-ledger
+
+bun.lockb
diff --git a/dephy-vending_machine-examples/Cargo.lock b/dephy-vending_machine-examples/Cargo.lock
new file mode 100644
index 0000000..71bcf68
--- /dev/null
+++ b/dephy-vending_machine-examples/Cargo.lock
@@ -0,0 +1,7413 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "addr2line"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfbe277e56a376000877090da837660b4427aad530e3028d44e0bffe4f89a1c1"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler2"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
+
+[[package]]
+name = "aead"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d122413f284cf2d62fb1b7db97e02edb8cda96d769b16e443a4f6195e35662b0"
+dependencies = [
+ "crypto-common",
+ "generic-array",
+]
+
+[[package]]
+name = "aes"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b169f7a6d4742236a0a00c541b845991d0ac43e546831af1249753ab4c3aa3a0"
+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures",
+]
+
+[[package]]
+name = "aes-gcm-siv"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ae0784134ba9375416d469ec31e7c5f9fa94405049cf08c5ce5b4698be673e0d"
+dependencies = [
+ "aead",
+ "aes",
+ "cipher",
+ "ctr",
+ "polyval",
+ "subtle",
+ "zeroize",
+]
+
+[[package]]
+name = "ahash"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "cfg-if",
+ "getrandom 0.2.15",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "aho-corasick"
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+ "memchr",
+]
+
+[[package]]
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+
+[[package]]
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+checksum = "94fb8275041c72129eb51b7d0322c29b8387a0386127718b096429201a5d6ece"
+dependencies = [
+ "alloc-no-stdlib",
+]
+
+[[package]]
+name = "allocator-api2"
+version = "0.2.21"
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+checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "anstream"
+version = "0.6.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8acc5369981196006228e28809f761875c0327210a891e941f4c683b3a99529b"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is_terminal_polyfill",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55cc3b69f167a1ef2e161439aa98aed94e6028e5f9a59be9a6ffb47aef1651f9"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.6"
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+checksum = "3b2d16507662817a6a20a9ea92df6652ee4f94f914589377d69f3b21bc5798a9"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "79947af37f4177cfead1110013d678905c37501914fba0efea834c3fe9a8d60c"
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+ "windows-sys 0.59.0",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "3.0.7"
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+dependencies = [
+ "anstyle",
+ "once_cell",
+ "windows-sys 0.59.0",
+]
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+[[package]]
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+ "ark-std",
+]
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+[[package]]
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+ "ark-poly",
+ "ark-serialize",
+ "ark-std",
+ "derivative",
+ "hashbrown 0.13.2",
+ "itertools 0.10.5",
+ "num-traits",
+ "zeroize",
+]
+
+[[package]]
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+checksum = "ec847af850f44ad29048935519032c33da8aa03340876d351dfab5660d2966ba"
+dependencies = [
+ "ark-ff-asm",
+ "ark-ff-macros",
+ "ark-serialize",
+ "ark-std",
+ "derivative",
+ "digest 0.10.7",
+ "itertools 0.10.5",
+ "num-bigint 0.4.6",
+ "num-traits",
+ "paste",
+ "rustc_version",
+ "zeroize",
+]
+
+[[package]]
+name = "ark-ff-asm"
+version = "0.4.2"
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+dependencies = [
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "ark-ff-macros"
+version = "0.4.2"
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+checksum = "7abe79b0e4288889c4574159ab790824d0033b9fdcb2a112a3182fac2e514565"
+dependencies = [
+ "num-bigint 0.4.6",
+ "num-traits",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "ark-poly"
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+checksum = "d320bfc44ee185d899ccbadfa8bc31aab923ce1558716e1997a1e74057fe86bf"
+dependencies = [
+ "ark-ff",
+ "ark-serialize",
+ "ark-std",
+ "derivative",
+ "hashbrown 0.13.2",
+]
+
+[[package]]
+name = "ark-serialize"
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+dependencies = [
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+ "ark-std",
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+ "num-bigint 0.4.6",
+]
+
+[[package]]
+name = "ark-serialize-derive"
+version = "0.4.2"
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+checksum = "ae3281bc6d0fd7e549af32b52511e1302185bd688fd3359fa36423346ff682ea"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "ark-std"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94893f1e0c6eeab764ade8dc4c0db24caf4fe7cbbaafc0eba0a9030f447b5185"
+dependencies = [
+ "num-traits",
+ "rand 0.8.5",
+]
+
+[[package]]
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diff --git a/dephy-vending_machine-examples/Cargo.toml b/dephy-vending_machine-examples/Cargo.toml
new file mode 100644
index 0000000..b440d8f
--- /dev/null
+++ b/dephy-vending_machine-examples/Cargo.toml
@@ -0,0 +1,36 @@
+[workspace]
+resolver = "2"
+members = [
+    "balance-payment-sdk",
+    "examples/*",
+]
+
+[workspace.package]
+license = "MIT"
+
+[workspace.dependencies]
+solana-client = { version = "2.2.0", git = "https://github.com/anza-xyz/agave.git", branch = "v2.2" }
+solana-program = "2.2.0"
+solana-sdk = { version = "2.2.0", features = ["openssl-vendored"] }
+solana-zk-token-sdk = { version = "2.2.0", git = "https://github.com/anza-xyz/agave.git", branch = "v2.2" }
+
+arrayref = "0.3.9"
+borsh = "0.10.4"
+curve25519-dalek = "4.1.3"
+num-derive = "0.4.2"
+num-traits = "0.2.19"
+serde = "1.0.217"
+serde_json = "1.0.137"
+serde_with = "3.12.0"
+sha2 = "0.10.8"
+thiserror = "2.0.11"
+tracing = "0.1.41"
+
+clap = "4.5.29"
+futures = "0.3.31"
+nostr = "0.38.0"
+nostr-sdk = "0.38.0"
+tokio = "1.43.0"
+tracing-subscriber = "0.3.19"
+
+dephy-balance-payment-sdk = { version = "0.1.0", path = "./balance-payment-sdk" }
diff --git a/dephy-vending_machine-examples/MIT-LICENSE b/dephy-vending_machine-examples/MIT-LICENSE
new file mode 100644
index 0000000..1784699
--- /dev/null
+++ b/dephy-vending_machine-examples/MIT-LICENSE
@@ -0,0 +1,20 @@
+Copyright (c) DEPHY TECHNOLOGY PTE. LTD.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/dephy-vending_machine-examples/README.md b/dephy-vending_machine-examples/README.md
new file mode 100644
index 0000000..18278b1
--- /dev/null
+++ b/dephy-vending_machine-examples/README.md
@@ -0,0 +1,42 @@
+# DePHY vending machine examples
+
+This is a vending machine showcase for DePHY Messaging Layer.
+
+## Online demo
+
+The program has deployed to Solana devnet, address: `GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9`
+
+See <https://balance-payment.pages.dev/program> for the dApp
+
+## How it works
+
+![](./doc/architecture.png)
+
+## Repo contents
+
+- [Solana program and dApp](./balance-payment)
+  - [dApp](./balance-payment/app)
+- [Pre-generated program Rust SDK](./balance-payment-sdk)
+- Examples
+  - [DeCharge](./examples/decharge-controller)
+  - [Gacha](./examples/gacha-controller)
+
+## Run from source
+
+1. Run DePHY vending machine workers by: `docker compose up`
+2. [Deploy the Solana program and run the dApp](./balance-payment/README.md)
+
+## TODO
+
+- Build a scripts to quick deploy a local demo
+- Rename DeCharge things to vending machine
+- Rich docs
+
+## Future works
+
+- Use an offchain account book to ensure the process transactionality
+- Indexer and a dashboard dAPP for showing order history
+
+## License
+
+MIT
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diff --git a/dephy-vending_machine-examples/balance-payment-sdk/Cargo.toml b/dephy-vending_machine-examples/balance-payment-sdk/Cargo.toml
new file mode 100644
index 0000000..aff6e3c
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+name = "dephy-balance-payment-sdk"
+version = "0.1.0"
+edition = "2021"
+license.workspace = true
+
+[features]
+default = ["serde"]
+serde = ["dep:serde", "dep:serde_with"]
+
+[dependencies]
+arrayref = { workspace = true }
+borsh = { workspace = true }
+curve25519-dalek = { workspace = true }
+num-derive = { workspace = true }
+num-traits = { workspace = true }
+serde = { workspace = true, optional = true }
+serde_json = { workspace = true }
+serde_with = { workspace = true, optional = true }
+sha2 = { workspace = true }
+solana-client = { workspace = true }
+solana-program = { workspace = true }
+solana-sdk = { workspace = true }
+solana-zk-token-sdk = { workspace = true }
+thiserror = { workspace = true }
+tracing = { workspace = true }
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/error.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/error.rs
new file mode 100644
index 0000000..78b612d
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/error.rs
@@ -0,0 +1,16 @@
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("Io error: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("Parse pubkey error: ")]
+    ParsePubkey(#[from] solana_program::pubkey::ParsePubkeyError),
+    #[error("Serde json error: {0}")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Solana client error: {0}")]
+    SolanaClient(#[from] solana_client::client_error::ClientError),
+    #[error("Signature verification failed: {0}")]
+    SignatureVerificationFailed(String),
+    #[error("Keypair read failed: {0}")]
+    KeypairReadFailed(Box<dyn std::error::Error>),
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/global_account.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/global_account.rs
new file mode 100644
index 0000000..ad25c9a
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/global_account.rs
@@ -0,0 +1,77 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+use solana_program::pubkey::Pubkey;
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct GlobalAccount {
+    pub discriminator: [u8; 8],
+    #[cfg_attr(
+        feature = "serde",
+        serde(with = "serde_with::As::<serde_with::DisplayFromStr>")
+    )]
+    pub authority: Pubkey,
+    #[cfg_attr(
+        feature = "serde",
+        serde(with = "serde_with::As::<serde_with::DisplayFromStr>")
+    )]
+    pub bot: Pubkey,
+    #[cfg_attr(
+        feature = "serde",
+        serde(with = "serde_with::As::<serde_with::DisplayFromStr>")
+    )]
+    pub treasury: Pubkey,
+}
+
+impl GlobalAccount {
+    pub const LEN: usize = 104;
+
+    #[inline(always)]
+    pub fn from_bytes(data: &[u8]) -> Result<Self, std::io::Error> {
+        let mut data = data;
+        Self::deserialize(&mut data)
+    }
+}
+
+impl<'a> TryFrom<&solana_program::account_info::AccountInfo<'a>> for GlobalAccount {
+    type Error = std::io::Error;
+
+    fn try_from(
+        account_info: &solana_program::account_info::AccountInfo<'a>,
+    ) -> Result<Self, Self::Error> {
+        let mut data: &[u8] = &(*account_info.data).borrow();
+        Self::deserialize(&mut data)
+    }
+}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::AccountDeserialize for GlobalAccount {
+    fn try_deserialize_unchecked(buf: &mut &[u8]) -> anchor_lang::Result<Self> {
+        Ok(Self::deserialize(buf)?)
+    }
+}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::AccountSerialize for GlobalAccount {}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::Owner for GlobalAccount {
+    fn owner() -> Pubkey {
+        crate::BALANCE_PAYMENT_ID
+    }
+}
+
+#[cfg(feature = "anchor-idl-build")]
+impl anchor_lang::IdlBuild for GlobalAccount {}
+
+#[cfg(feature = "anchor-idl-build")]
+impl anchor_lang::Discriminator for GlobalAccount {
+    const DISCRIMINATOR: [u8; 8] = [0; 8];
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/lock_account.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/lock_account.rs
new file mode 100644
index 0000000..07ca4c5
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/lock_account.rs
@@ -0,0 +1,62 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct LockAccount {
+    pub discriminator: [u8; 8],
+    pub amount: u64,
+}
+
+impl LockAccount {
+    pub const LEN: usize = 16;
+
+    #[inline(always)]
+    pub fn from_bytes(data: &[u8]) -> Result<Self, std::io::Error> {
+        let mut data = data;
+        Self::deserialize(&mut data)
+    }
+}
+
+impl<'a> TryFrom<&solana_program::account_info::AccountInfo<'a>> for LockAccount {
+    type Error = std::io::Error;
+
+    fn try_from(
+        account_info: &solana_program::account_info::AccountInfo<'a>,
+    ) -> Result<Self, Self::Error> {
+        let mut data: &[u8] = &(*account_info.data).borrow();
+        Self::deserialize(&mut data)
+    }
+}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::AccountDeserialize for LockAccount {
+    fn try_deserialize_unchecked(buf: &mut &[u8]) -> anchor_lang::Result<Self> {
+        Ok(Self::deserialize(buf)?)
+    }
+}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::AccountSerialize for LockAccount {}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::Owner for LockAccount {
+    fn owner() -> Pubkey {
+        crate::BALANCE_PAYMENT_ID
+    }
+}
+
+#[cfg(feature = "anchor-idl-build")]
+impl anchor_lang::IdlBuild for LockAccount {}
+
+#[cfg(feature = "anchor-idl-build")]
+impl anchor_lang::Discriminator for LockAccount {
+    const DISCRIMINATOR: [u8; 8] = [0; 8];
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/mod.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/mod.rs
new file mode 100644
index 0000000..c609503
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/mod.rs
@@ -0,0 +1,14 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+pub(crate) mod r#global_account;
+pub(crate) mod r#lock_account;
+pub(crate) mod r#user_account;
+
+pub use self::r#global_account::*;
+pub use self::r#lock_account::*;
+pub use self::r#user_account::*;
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/user_account.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/user_account.rs
new file mode 100644
index 0000000..aee821a
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/accounts/user_account.rs
@@ -0,0 +1,69 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+use solana_program::pubkey::Pubkey;
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct UserAccount {
+    pub discriminator: [u8; 8],
+    pub nonce: u64,
+    pub locked_amount: u64,
+    #[cfg_attr(
+        feature = "serde",
+        serde(with = "serde_with::As::<serde_with::DisplayFromStr>")
+    )]
+    pub vault: Pubkey,
+}
+
+impl UserAccount {
+    pub const LEN: usize = 56;
+
+    #[inline(always)]
+    pub fn from_bytes(data: &[u8]) -> Result<Self, std::io::Error> {
+        let mut data = data;
+        Self::deserialize(&mut data)
+    }
+}
+
+impl<'a> TryFrom<&solana_program::account_info::AccountInfo<'a>> for UserAccount {
+    type Error = std::io::Error;
+
+    fn try_from(
+        account_info: &solana_program::account_info::AccountInfo<'a>,
+    ) -> Result<Self, Self::Error> {
+        let mut data: &[u8] = &(*account_info.data).borrow();
+        Self::deserialize(&mut data)
+    }
+}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::AccountDeserialize for UserAccount {
+    fn try_deserialize_unchecked(buf: &mut &[u8]) -> anchor_lang::Result<Self> {
+        Ok(Self::deserialize(buf)?)
+    }
+}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::AccountSerialize for UserAccount {}
+
+#[cfg(feature = "anchor")]
+impl anchor_lang::Owner for UserAccount {
+    fn owner() -> Pubkey {
+        crate::BALANCE_PAYMENT_ID
+    }
+}
+
+#[cfg(feature = "anchor-idl-build")]
+impl anchor_lang::IdlBuild for UserAccount {}
+
+#[cfg(feature = "anchor-idl-build")]
+impl anchor_lang::Discriminator for UserAccount {
+    const DISCRIMINATOR: [u8; 8] = [0; 8];
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/errors/balance_payment.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/errors/balance_payment.rs
new file mode 100644
index 0000000..49eaf84
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/errors/balance_payment.rs
@@ -0,0 +1,43 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use num_derive::FromPrimitive;
+use thiserror::Error;
+
+#[derive(Clone, Debug, Eq, Error, FromPrimitive, PartialEq)]
+pub enum BalancePaymentError {
+    /// 6000 - Unauthorized access.
+    #[error("Unauthorized access.")]
+    Unauthorized = 0x1770,
+    /// 6001 - Insufficient funds.
+    #[error("Insufficient funds.")]
+    InsufficientFunds = 0x1771,
+    /// 6002 - The signature format or recovery ID is incorrect.
+    #[error("The signature format or recovery ID is incorrect.")]
+    SignatureFormatInvalid = 0x1772,
+    /// 6003 - Failed to recover public key from signature.
+    #[error("Failed to recover public key from signature.")]
+    SignatureRecoveryFailed = 0x1773,
+    /// 6004 - The recovered public key does not match the user's public key.
+    #[error("The recovered public key does not match the user's public key.")]
+    SignatureMismatch = 0x1774,
+    /// 6005 - The signature is expired.
+    #[error("The signature is expired.")]
+    SignatureExpired = 0x1775,
+}
+
+impl solana_program::program_error::PrintProgramError for BalancePaymentError {
+    fn print<E>(&self) {
+        solana_program::msg!(&self.to_string());
+    }
+}
+
+impl<T> solana_program::decode_error::DecodeError<T> for BalancePaymentError {
+    fn type_of() -> &'static str {
+        "BalancePaymentError"
+    }
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/errors/mod.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/errors/mod.rs
new file mode 100644
index 0000000..4fe38d1
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/errors/mod.rs
@@ -0,0 +1,10 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+pub(crate) mod balance_payment;
+
+pub use self::balance_payment::BalancePaymentError;
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/deposit.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/deposit.rs
new file mode 100644
index 0000000..3375c27
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/deposit.rs
@@ -0,0 +1,472 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Deposit {
+    pub user_account: solana_program::pubkey::Pubkey,
+
+    pub user: solana_program::pubkey::Pubkey,
+
+    pub vault: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Deposit {
+    pub fn instruction(
+        &self,
+        args: DepositInstructionArgs,
+    ) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(args, &[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        args: DepositInstructionArgs,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(5 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.vault, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let mut data = DepositInstructionData::new().try_to_vec().unwrap();
+        let mut args = args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct DepositInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl DepositInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [242, 35, 198, 137, 82, 225, 242, 182],
+        }
+    }
+}
+
+impl Default for DepositInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct DepositInstructionArgs {
+    pub amount: u64,
+}
+
+/// Instruction builder for `Deposit`.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` user_account
+///   1. `[writable, signer]` user
+///   2. `[writable]` vault
+///   3. `[writable, signer]` payer
+///   4. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct DepositBuilder {
+    user_account: Option<solana_program::pubkey::Pubkey>,
+    user: Option<solana_program::pubkey::Pubkey>,
+    vault: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    amount: Option<u64>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl DepositBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn user_account(&mut self, user_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn amount(&mut self, amount: u64) -> &mut Self {
+        self.amount = Some(amount);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Deposit {
+            user_account: self.user_account.expect("user_account is not set"),
+            user: self.user.expect("user is not set"),
+            vault: self.vault.expect("vault is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+        let args = DepositInstructionArgs {
+            amount: self.amount.clone().expect("amount is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(args, &self.__remaining_accounts)
+    }
+}
+
+/// `deposit` CPI accounts.
+pub struct DepositCpiAccounts<'a, 'b> {
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `deposit` CPI instruction.
+pub struct DepositCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    /// The arguments for the instruction.
+    pub __args: DepositInstructionArgs,
+}
+
+impl<'a, 'b> DepositCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: DepositCpiAccounts<'a, 'b>,
+        args: DepositInstructionArgs,
+    ) -> Self {
+        Self {
+            __program: program,
+            user_account: accounts.user_account,
+            user: accounts.user,
+            vault: accounts.vault,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+            __args: args,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(5 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.vault.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let mut data = DepositInstructionData::new().try_to_vec().unwrap();
+        let mut args = self.__args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(6 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.user_account.clone());
+        account_infos.push(self.user.clone());
+        account_infos.push(self.vault.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Deposit` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` user_account
+///   1. `[writable, signer]` user
+///   2. `[writable]` vault
+///   3. `[writable, signer]` payer
+///   4. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct DepositCpiBuilder<'a, 'b> {
+    instruction: Box<DepositCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> DepositCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(DepositCpiBuilderInstruction {
+            __program: program,
+            user_account: None,
+            user: None,
+            vault: None,
+            payer: None,
+            system_program: None,
+            amount: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn user_account(
+        &mut self,
+        user_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn amount(&mut self, amount: u64) -> &mut Self {
+        self.instruction.amount = Some(amount);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let args = DepositInstructionArgs {
+            amount: self.instruction.amount.clone().expect("amount is not set"),
+        };
+        let instruction = DepositCpi {
+            __program: self.instruction.__program,
+
+            user_account: self
+                .instruction
+                .user_account
+                .expect("user_account is not set"),
+
+            user: self.instruction.user.expect("user is not set"),
+
+            vault: self.instruction.vault.expect("vault is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+            __args: args,
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct DepositCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    user_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    vault: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    amount: Option<u64>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/initialize.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/initialize.rs
new file mode 100644
index 0000000..3e307bf
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/initialize.rs
@@ -0,0 +1,475 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Initialize {
+    pub global_account: solana_program::pubkey::Pubkey,
+
+    pub authority: solana_program::pubkey::Pubkey,
+
+    pub treasury: solana_program::pubkey::Pubkey,
+
+    pub bot: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Initialize {
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(&[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(6 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.global_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.authority,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.treasury,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.bot, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let data = InitializeInstructionData::new().try_to_vec().unwrap();
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct InitializeInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl InitializeInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [175, 175, 109, 31, 13, 152, 155, 237],
+        }
+    }
+}
+
+impl Default for InitializeInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Instruction builder for `Initialize`.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` global_account
+///   1. `[]` authority
+///   2. `[]` treasury
+///   3. `[]` bot
+///   4. `[writable, signer]` payer
+///   5. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct InitializeBuilder {
+    global_account: Option<solana_program::pubkey::Pubkey>,
+    authority: Option<solana_program::pubkey::Pubkey>,
+    treasury: Option<solana_program::pubkey::Pubkey>,
+    bot: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl InitializeBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn global_account(&mut self, global_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn authority(&mut self, authority: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.authority = Some(authority);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(&mut self, treasury: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Initialize {
+            global_account: self.global_account.expect("global_account is not set"),
+            authority: self.authority.expect("authority is not set"),
+            treasury: self.treasury.expect("treasury is not set"),
+            bot: self.bot.expect("bot is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+
+        accounts.instruction_with_remaining_accounts(&self.__remaining_accounts)
+    }
+}
+
+/// `initialize` CPI accounts.
+pub struct InitializeCpiAccounts<'a, 'b> {
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub authority: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `initialize` CPI instruction.
+pub struct InitializeCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub authority: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+impl<'a, 'b> InitializeCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: InitializeCpiAccounts<'a, 'b>,
+    ) -> Self {
+        Self {
+            __program: program,
+            global_account: accounts.global_account,
+            authority: accounts.authority,
+            treasury: accounts.treasury,
+            bot: accounts.bot,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(6 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.global_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.authority.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.treasury.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.bot.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let data = InitializeInstructionData::new().try_to_vec().unwrap();
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(7 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.global_account.clone());
+        account_infos.push(self.authority.clone());
+        account_infos.push(self.treasury.clone());
+        account_infos.push(self.bot.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Initialize` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` global_account
+///   1. `[]` authority
+///   2. `[]` treasury
+///   3. `[]` bot
+///   4. `[writable, signer]` payer
+///   5. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct InitializeCpiBuilder<'a, 'b> {
+    instruction: Box<InitializeCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> InitializeCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(InitializeCpiBuilderInstruction {
+            __program: program,
+            global_account: None,
+            authority: None,
+            treasury: None,
+            bot: None,
+            payer: None,
+            system_program: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn global_account(
+        &mut self,
+        global_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn authority(
+        &mut self,
+        authority: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.authority = Some(authority);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(
+        &mut self,
+        treasury: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let instruction = InitializeCpi {
+            __program: self.instruction.__program,
+
+            global_account: self
+                .instruction
+                .global_account
+                .expect("global_account is not set"),
+
+            authority: self.instruction.authority.expect("authority is not set"),
+
+            treasury: self.instruction.treasury.expect("treasury is not set"),
+
+            bot: self.instruction.bot.expect("bot is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct InitializeCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    global_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    authority: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    treasury: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    bot: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/lock.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/lock.rs
new file mode 100644
index 0000000..14c1b79
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/lock.rs
@@ -0,0 +1,606 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use crate::generated::types::ED25519RecoverInfo;
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Lock {
+    pub global_account: solana_program::pubkey::Pubkey,
+
+    pub user_account: solana_program::pubkey::Pubkey,
+
+    pub user: solana_program::pubkey::Pubkey,
+
+    pub lock_account: solana_program::pubkey::Pubkey,
+
+    pub vault: solana_program::pubkey::Pubkey,
+
+    pub bot: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Lock {
+    pub fn instruction(
+        &self,
+        args: LockInstructionArgs,
+    ) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(args, &[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        args: LockInstructionArgs,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(8 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.global_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.lock_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.vault, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.bot, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let mut data = LockInstructionData::new().try_to_vec().unwrap();
+        let mut args = args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct LockInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl LockInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [21, 19, 208, 43, 237, 62, 255, 87],
+        }
+    }
+}
+
+impl Default for LockInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct LockInstructionArgs {
+    pub recover_info: ED25519RecoverInfo,
+    pub amount: u64,
+}
+
+/// Instruction builder for `Lock`.
+///
+/// ### Accounts:
+///
+///   0. `[]` global_account
+///   1. `[writable]` user_account
+///   2. `[writable]` user
+///   3. `[writable]` lock_account
+///   4. `[]` vault
+///   5. `[signer]` bot
+///   6. `[writable, signer]` payer
+///   7. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct LockBuilder {
+    global_account: Option<solana_program::pubkey::Pubkey>,
+    user_account: Option<solana_program::pubkey::Pubkey>,
+    user: Option<solana_program::pubkey::Pubkey>,
+    lock_account: Option<solana_program::pubkey::Pubkey>,
+    vault: Option<solana_program::pubkey::Pubkey>,
+    bot: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    recover_info: Option<ED25519RecoverInfo>,
+    amount: Option<u64>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl LockBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn global_account(&mut self, global_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user_account(&mut self, user_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn lock_account(&mut self, lock_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.lock_account = Some(lock_account);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn recover_info(&mut self, recover_info: ED25519RecoverInfo) -> &mut Self {
+        self.recover_info = Some(recover_info);
+        self
+    }
+    #[inline(always)]
+    pub fn amount(&mut self, amount: u64) -> &mut Self {
+        self.amount = Some(amount);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Lock {
+            global_account: self.global_account.expect("global_account is not set"),
+            user_account: self.user_account.expect("user_account is not set"),
+            user: self.user.expect("user is not set"),
+            lock_account: self.lock_account.expect("lock_account is not set"),
+            vault: self.vault.expect("vault is not set"),
+            bot: self.bot.expect("bot is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+        let args = LockInstructionArgs {
+            recover_info: self.recover_info.clone().expect("recover_info is not set"),
+            amount: self.amount.clone().expect("amount is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(args, &self.__remaining_accounts)
+    }
+}
+
+/// `lock` CPI accounts.
+pub struct LockCpiAccounts<'a, 'b> {
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub lock_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `lock` CPI instruction.
+pub struct LockCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub lock_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    /// The arguments for the instruction.
+    pub __args: LockInstructionArgs,
+}
+
+impl<'a, 'b> LockCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: LockCpiAccounts<'a, 'b>,
+        args: LockInstructionArgs,
+    ) -> Self {
+        Self {
+            __program: program,
+            global_account: accounts.global_account,
+            user_account: accounts.user_account,
+            user: accounts.user,
+            lock_account: accounts.lock_account,
+            vault: accounts.vault,
+            bot: accounts.bot,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+            __args: args,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(8 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.global_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.lock_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.vault.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.bot.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let mut data = LockInstructionData::new().try_to_vec().unwrap();
+        let mut args = self.__args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(9 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.global_account.clone());
+        account_infos.push(self.user_account.clone());
+        account_infos.push(self.user.clone());
+        account_infos.push(self.lock_account.clone());
+        account_infos.push(self.vault.clone());
+        account_infos.push(self.bot.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Lock` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[]` global_account
+///   1. `[writable]` user_account
+///   2. `[writable]` user
+///   3. `[writable]` lock_account
+///   4. `[]` vault
+///   5. `[signer]` bot
+///   6. `[writable, signer]` payer
+///   7. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct LockCpiBuilder<'a, 'b> {
+    instruction: Box<LockCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> LockCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(LockCpiBuilderInstruction {
+            __program: program,
+            global_account: None,
+            user_account: None,
+            user: None,
+            lock_account: None,
+            vault: None,
+            bot: None,
+            payer: None,
+            system_program: None,
+            recover_info: None,
+            amount: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn global_account(
+        &mut self,
+        global_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user_account(
+        &mut self,
+        user_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn lock_account(
+        &mut self,
+        lock_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.lock_account = Some(lock_account);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn recover_info(&mut self, recover_info: ED25519RecoverInfo) -> &mut Self {
+        self.instruction.recover_info = Some(recover_info);
+        self
+    }
+    #[inline(always)]
+    pub fn amount(&mut self, amount: u64) -> &mut Self {
+        self.instruction.amount = Some(amount);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let args = LockInstructionArgs {
+            recover_info: self
+                .instruction
+                .recover_info
+                .clone()
+                .expect("recover_info is not set"),
+            amount: self.instruction.amount.clone().expect("amount is not set"),
+        };
+        let instruction = LockCpi {
+            __program: self.instruction.__program,
+
+            global_account: self
+                .instruction
+                .global_account
+                .expect("global_account is not set"),
+
+            user_account: self
+                .instruction
+                .user_account
+                .expect("user_account is not set"),
+
+            user: self.instruction.user.expect("user is not set"),
+
+            lock_account: self
+                .instruction
+                .lock_account
+                .expect("lock_account is not set"),
+
+            vault: self.instruction.vault.expect("vault is not set"),
+
+            bot: self.instruction.bot.expect("bot is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+            __args: args,
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct LockCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    global_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    lock_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    vault: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    bot: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    recover_info: Option<ED25519RecoverInfo>,
+    amount: Option<u64>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/mod.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/mod.rs
new file mode 100644
index 0000000..e9e2ab0
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/mod.rs
@@ -0,0 +1,26 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+pub(crate) mod r#deposit;
+pub(crate) mod r#initialize;
+pub(crate) mod r#lock;
+pub(crate) mod r#pay;
+pub(crate) mod r#register;
+pub(crate) mod r#set_bot;
+pub(crate) mod r#set_treasury;
+pub(crate) mod r#settle;
+pub(crate) mod r#withdraw;
+
+pub use self::r#deposit::*;
+pub use self::r#initialize::*;
+pub use self::r#lock::*;
+pub use self::r#pay::*;
+pub use self::r#register::*;
+pub use self::r#set_bot::*;
+pub use self::r#set_treasury::*;
+pub use self::r#settle::*;
+pub use self::r#withdraw::*;
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/pay.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/pay.rs
new file mode 100644
index 0000000..afe1322
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/pay.rs
@@ -0,0 +1,610 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use crate::generated::types::ED25519RecoverInfo;
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Pay {
+    pub global_account: solana_program::pubkey::Pubkey,
+
+    pub user_account: solana_program::pubkey::Pubkey,
+
+    pub user: solana_program::pubkey::Pubkey,
+
+    pub treasury: solana_program::pubkey::Pubkey,
+
+    pub vault: solana_program::pubkey::Pubkey,
+
+    pub bot: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Pay {
+    pub fn instruction(
+        &self,
+        args: PayInstructionArgs,
+    ) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(args, &[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        args: PayInstructionArgs,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(8 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.global_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.treasury,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.vault, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.bot, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let mut data = PayInstructionData::new().try_to_vec().unwrap();
+        let mut args = args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct PayInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl PayInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [119, 18, 216, 65, 192, 117, 122, 220],
+        }
+    }
+}
+
+impl Default for PayInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct PayInstructionArgs {
+    pub recover_info: ED25519RecoverInfo,
+    pub amount_to_transfer: u64,
+}
+
+/// Instruction builder for `Pay`.
+///
+/// ### Accounts:
+///
+///   0. `[]` global_account
+///   1. `[writable]` user_account
+///   2. `[writable]` user
+///   3. `[writable]` treasury
+///   4. `[writable]` vault
+///   5. `[signer]` bot
+///   6. `[writable, signer]` payer
+///   7. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct PayBuilder {
+    global_account: Option<solana_program::pubkey::Pubkey>,
+    user_account: Option<solana_program::pubkey::Pubkey>,
+    user: Option<solana_program::pubkey::Pubkey>,
+    treasury: Option<solana_program::pubkey::Pubkey>,
+    vault: Option<solana_program::pubkey::Pubkey>,
+    bot: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    recover_info: Option<ED25519RecoverInfo>,
+    amount_to_transfer: Option<u64>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl PayBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn global_account(&mut self, global_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user_account(&mut self, user_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(&mut self, treasury: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn recover_info(&mut self, recover_info: ED25519RecoverInfo) -> &mut Self {
+        self.recover_info = Some(recover_info);
+        self
+    }
+    #[inline(always)]
+    pub fn amount_to_transfer(&mut self, amount_to_transfer: u64) -> &mut Self {
+        self.amount_to_transfer = Some(amount_to_transfer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Pay {
+            global_account: self.global_account.expect("global_account is not set"),
+            user_account: self.user_account.expect("user_account is not set"),
+            user: self.user.expect("user is not set"),
+            treasury: self.treasury.expect("treasury is not set"),
+            vault: self.vault.expect("vault is not set"),
+            bot: self.bot.expect("bot is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+        let args = PayInstructionArgs {
+            recover_info: self.recover_info.clone().expect("recover_info is not set"),
+            amount_to_transfer: self
+                .amount_to_transfer
+                .clone()
+                .expect("amount_to_transfer is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(args, &self.__remaining_accounts)
+    }
+}
+
+/// `pay` CPI accounts.
+pub struct PayCpiAccounts<'a, 'b> {
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `pay` CPI instruction.
+pub struct PayCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    /// The arguments for the instruction.
+    pub __args: PayInstructionArgs,
+}
+
+impl<'a, 'b> PayCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: PayCpiAccounts<'a, 'b>,
+        args: PayInstructionArgs,
+    ) -> Self {
+        Self {
+            __program: program,
+            global_account: accounts.global_account,
+            user_account: accounts.user_account,
+            user: accounts.user,
+            treasury: accounts.treasury,
+            vault: accounts.vault,
+            bot: accounts.bot,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+            __args: args,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(8 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.global_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.treasury.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.vault.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.bot.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let mut data = PayInstructionData::new().try_to_vec().unwrap();
+        let mut args = self.__args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(9 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.global_account.clone());
+        account_infos.push(self.user_account.clone());
+        account_infos.push(self.user.clone());
+        account_infos.push(self.treasury.clone());
+        account_infos.push(self.vault.clone());
+        account_infos.push(self.bot.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Pay` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[]` global_account
+///   1. `[writable]` user_account
+///   2. `[writable]` user
+///   3. `[writable]` treasury
+///   4. `[writable]` vault
+///   5. `[signer]` bot
+///   6. `[writable, signer]` payer
+///   7. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct PayCpiBuilder<'a, 'b> {
+    instruction: Box<PayCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> PayCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(PayCpiBuilderInstruction {
+            __program: program,
+            global_account: None,
+            user_account: None,
+            user: None,
+            treasury: None,
+            vault: None,
+            bot: None,
+            payer: None,
+            system_program: None,
+            recover_info: None,
+            amount_to_transfer: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn global_account(
+        &mut self,
+        global_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user_account(
+        &mut self,
+        user_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(
+        &mut self,
+        treasury: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn recover_info(&mut self, recover_info: ED25519RecoverInfo) -> &mut Self {
+        self.instruction.recover_info = Some(recover_info);
+        self
+    }
+    #[inline(always)]
+    pub fn amount_to_transfer(&mut self, amount_to_transfer: u64) -> &mut Self {
+        self.instruction.amount_to_transfer = Some(amount_to_transfer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let args = PayInstructionArgs {
+            recover_info: self
+                .instruction
+                .recover_info
+                .clone()
+                .expect("recover_info is not set"),
+            amount_to_transfer: self
+                .instruction
+                .amount_to_transfer
+                .clone()
+                .expect("amount_to_transfer is not set"),
+        };
+        let instruction = PayCpi {
+            __program: self.instruction.__program,
+
+            global_account: self
+                .instruction
+                .global_account
+                .expect("global_account is not set"),
+
+            user_account: self
+                .instruction
+                .user_account
+                .expect("user_account is not set"),
+
+            user: self.instruction.user.expect("user is not set"),
+
+            treasury: self.instruction.treasury.expect("treasury is not set"),
+
+            vault: self.instruction.vault.expect("vault is not set"),
+
+            bot: self.instruction.bot.expect("bot is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+            __args: args,
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct PayCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    global_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    treasury: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    vault: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    bot: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    recover_info: Option<ED25519RecoverInfo>,
+    amount_to_transfer: Option<u64>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/register.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/register.rs
new file mode 100644
index 0000000..f9160de
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/register.rs
@@ -0,0 +1,434 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Register {
+    pub user_account: solana_program::pubkey::Pubkey,
+
+    pub user: solana_program::pubkey::Pubkey,
+
+    pub vault: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Register {
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(&[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(5 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.user, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.vault, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let data = RegisterInstructionData::new().try_to_vec().unwrap();
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct RegisterInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl RegisterInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [211, 124, 67, 15, 211, 194, 178, 240],
+        }
+    }
+}
+
+impl Default for RegisterInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Instruction builder for `Register`.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` user_account
+///   1. `[signer]` user
+///   2. `[]` vault
+///   3. `[writable, signer]` payer
+///   4. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct RegisterBuilder {
+    user_account: Option<solana_program::pubkey::Pubkey>,
+    user: Option<solana_program::pubkey::Pubkey>,
+    vault: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl RegisterBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn user_account(&mut self, user_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Register {
+            user_account: self.user_account.expect("user_account is not set"),
+            user: self.user.expect("user is not set"),
+            vault: self.vault.expect("vault is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+
+        accounts.instruction_with_remaining_accounts(&self.__remaining_accounts)
+    }
+}
+
+/// `register` CPI accounts.
+pub struct RegisterCpiAccounts<'a, 'b> {
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `register` CPI instruction.
+pub struct RegisterCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+impl<'a, 'b> RegisterCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: RegisterCpiAccounts<'a, 'b>,
+    ) -> Self {
+        Self {
+            __program: program,
+            user_account: accounts.user_account,
+            user: accounts.user,
+            vault: accounts.vault,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(5 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.user.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.vault.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let data = RegisterInstructionData::new().try_to_vec().unwrap();
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(6 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.user_account.clone());
+        account_infos.push(self.user.clone());
+        account_infos.push(self.vault.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Register` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` user_account
+///   1. `[signer]` user
+///   2. `[]` vault
+///   3. `[writable, signer]` payer
+///   4. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct RegisterCpiBuilder<'a, 'b> {
+    instruction: Box<RegisterCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> RegisterCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(RegisterCpiBuilderInstruction {
+            __program: program,
+            user_account: None,
+            user: None,
+            vault: None,
+            payer: None,
+            system_program: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn user_account(
+        &mut self,
+        user_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let instruction = RegisterCpi {
+            __program: self.instruction.__program,
+
+            user_account: self
+                .instruction
+                .user_account
+                .expect("user_account is not set"),
+
+            user: self.instruction.user.expect("user is not set"),
+
+            vault: self.instruction.vault.expect("vault is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct RegisterCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    user_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    vault: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/set_bot.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/set_bot.rs
new file mode 100644
index 0000000..4950961
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/set_bot.rs
@@ -0,0 +1,395 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct SetBot {
+    pub global_account: solana_program::pubkey::Pubkey,
+
+    pub authority: solana_program::pubkey::Pubkey,
+
+    pub bot: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+}
+
+impl SetBot {
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(&[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(4 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.global_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.authority,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.bot, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let data = SetBotInstructionData::new().try_to_vec().unwrap();
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct SetBotInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl SetBotInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [136, 185, 99, 236, 200, 131, 204, 118],
+        }
+    }
+}
+
+impl Default for SetBotInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Instruction builder for `SetBot`.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` global_account
+///   1. `[signer]` authority
+///   2. `[]` bot
+///   3. `[writable, signer]` payer
+#[derive(Clone, Debug, Default)]
+pub struct SetBotBuilder {
+    global_account: Option<solana_program::pubkey::Pubkey>,
+    authority: Option<solana_program::pubkey::Pubkey>,
+    bot: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl SetBotBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn global_account(&mut self, global_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn authority(&mut self, authority: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.authority = Some(authority);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = SetBot {
+            global_account: self.global_account.expect("global_account is not set"),
+            authority: self.authority.expect("authority is not set"),
+            bot: self.bot.expect("bot is not set"),
+            payer: self.payer.expect("payer is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(&self.__remaining_accounts)
+    }
+}
+
+/// `set_bot` CPI accounts.
+pub struct SetBotCpiAccounts<'a, 'b> {
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub authority: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `set_bot` CPI instruction.
+pub struct SetBotCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub authority: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+impl<'a, 'b> SetBotCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: SetBotCpiAccounts<'a, 'b>,
+    ) -> Self {
+        Self {
+            __program: program,
+            global_account: accounts.global_account,
+            authority: accounts.authority,
+            bot: accounts.bot,
+            payer: accounts.payer,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(4 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.global_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.authority.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.bot.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let data = SetBotInstructionData::new().try_to_vec().unwrap();
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(5 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.global_account.clone());
+        account_infos.push(self.authority.clone());
+        account_infos.push(self.bot.clone());
+        account_infos.push(self.payer.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `SetBot` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` global_account
+///   1. `[signer]` authority
+///   2. `[]` bot
+///   3. `[writable, signer]` payer
+#[derive(Clone, Debug)]
+pub struct SetBotCpiBuilder<'a, 'b> {
+    instruction: Box<SetBotCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> SetBotCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(SetBotCpiBuilderInstruction {
+            __program: program,
+            global_account: None,
+            authority: None,
+            bot: None,
+            payer: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn global_account(
+        &mut self,
+        global_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn authority(
+        &mut self,
+        authority: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.authority = Some(authority);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let instruction = SetBotCpi {
+            __program: self.instruction.__program,
+
+            global_account: self
+                .instruction
+                .global_account
+                .expect("global_account is not set"),
+
+            authority: self.instruction.authority.expect("authority is not set"),
+
+            bot: self.instruction.bot.expect("bot is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct SetBotCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    global_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    authority: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    bot: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/set_treasury.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/set_treasury.rs
new file mode 100644
index 0000000..edc79a7
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/set_treasury.rs
@@ -0,0 +1,399 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct SetTreasury {
+    pub global_account: solana_program::pubkey::Pubkey,
+
+    pub authority: solana_program::pubkey::Pubkey,
+
+    pub treasury: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+}
+
+impl SetTreasury {
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(&[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(4 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.global_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.authority,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.treasury,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let data = SetTreasuryInstructionData::new().try_to_vec().unwrap();
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct SetTreasuryInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl SetTreasuryInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [57, 97, 196, 95, 195, 206, 106, 136],
+        }
+    }
+}
+
+impl Default for SetTreasuryInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Instruction builder for `SetTreasury`.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` global_account
+///   1. `[signer]` authority
+///   2. `[]` treasury
+///   3. `[writable, signer]` payer
+#[derive(Clone, Debug, Default)]
+pub struct SetTreasuryBuilder {
+    global_account: Option<solana_program::pubkey::Pubkey>,
+    authority: Option<solana_program::pubkey::Pubkey>,
+    treasury: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl SetTreasuryBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn global_account(&mut self, global_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn authority(&mut self, authority: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.authority = Some(authority);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(&mut self, treasury: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = SetTreasury {
+            global_account: self.global_account.expect("global_account is not set"),
+            authority: self.authority.expect("authority is not set"),
+            treasury: self.treasury.expect("treasury is not set"),
+            payer: self.payer.expect("payer is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(&self.__remaining_accounts)
+    }
+}
+
+/// `set_treasury` CPI accounts.
+pub struct SetTreasuryCpiAccounts<'a, 'b> {
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub authority: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `set_treasury` CPI instruction.
+pub struct SetTreasuryCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub authority: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+impl<'a, 'b> SetTreasuryCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: SetTreasuryCpiAccounts<'a, 'b>,
+    ) -> Self {
+        Self {
+            __program: program,
+            global_account: accounts.global_account,
+            authority: accounts.authority,
+            treasury: accounts.treasury,
+            payer: accounts.payer,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(4 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.global_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.authority.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.treasury.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let data = SetTreasuryInstructionData::new().try_to_vec().unwrap();
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(5 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.global_account.clone());
+        account_infos.push(self.authority.clone());
+        account_infos.push(self.treasury.clone());
+        account_infos.push(self.payer.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `SetTreasury` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` global_account
+///   1. `[signer]` authority
+///   2. `[]` treasury
+///   3. `[writable, signer]` payer
+#[derive(Clone, Debug)]
+pub struct SetTreasuryCpiBuilder<'a, 'b> {
+    instruction: Box<SetTreasuryCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> SetTreasuryCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(SetTreasuryCpiBuilderInstruction {
+            __program: program,
+            global_account: None,
+            authority: None,
+            treasury: None,
+            payer: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn global_account(
+        &mut self,
+        global_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn authority(
+        &mut self,
+        authority: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.authority = Some(authority);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(
+        &mut self,
+        treasury: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let instruction = SetTreasuryCpi {
+            __program: self.instruction.__program,
+
+            global_account: self
+                .instruction
+                .global_account
+                .expect("global_account is not set"),
+
+            authority: self.instruction.authority.expect("authority is not set"),
+
+            treasury: self.instruction.treasury.expect("treasury is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct SetTreasuryCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    global_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    authority: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    treasury: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/settle.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/settle.rs
new file mode 100644
index 0000000..7839d3b
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/settle.rs
@@ -0,0 +1,645 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Settle {
+    pub global_account: solana_program::pubkey::Pubkey,
+
+    pub user_account: solana_program::pubkey::Pubkey,
+
+    pub user: solana_program::pubkey::Pubkey,
+
+    pub treasury: solana_program::pubkey::Pubkey,
+
+    pub lock_account: solana_program::pubkey::Pubkey,
+
+    pub vault: solana_program::pubkey::Pubkey,
+
+    pub bot: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Settle {
+    pub fn instruction(
+        &self,
+        args: SettleInstructionArgs,
+    ) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(args, &[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        args: SettleInstructionArgs,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(9 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.global_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.treasury,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.lock_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.vault, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.bot, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let mut data = SettleInstructionData::new().try_to_vec().unwrap();
+        let mut args = args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct SettleInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl SettleInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [175, 42, 185, 87, 144, 131, 102, 212],
+        }
+    }
+}
+
+impl Default for SettleInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct SettleInstructionArgs {
+    pub nonce: u64,
+    pub amount_to_transfer: u64,
+}
+
+/// Instruction builder for `Settle`.
+///
+/// ### Accounts:
+///
+///   0. `[]` global_account
+///   1. `[writable]` user_account
+///   2. `[writable]` user
+///   3. `[writable]` treasury
+///   4. `[writable]` lock_account
+///   5. `[writable]` vault
+///   6. `[signer]` bot
+///   7. `[writable, signer]` payer
+///   8. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct SettleBuilder {
+    global_account: Option<solana_program::pubkey::Pubkey>,
+    user_account: Option<solana_program::pubkey::Pubkey>,
+    user: Option<solana_program::pubkey::Pubkey>,
+    treasury: Option<solana_program::pubkey::Pubkey>,
+    lock_account: Option<solana_program::pubkey::Pubkey>,
+    vault: Option<solana_program::pubkey::Pubkey>,
+    bot: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    nonce: Option<u64>,
+    amount_to_transfer: Option<u64>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl SettleBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn global_account(&mut self, global_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user_account(&mut self, user_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(&mut self, treasury: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn lock_account(&mut self, lock_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.lock_account = Some(lock_account);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn nonce(&mut self, nonce: u64) -> &mut Self {
+        self.nonce = Some(nonce);
+        self
+    }
+    #[inline(always)]
+    pub fn amount_to_transfer(&mut self, amount_to_transfer: u64) -> &mut Self {
+        self.amount_to_transfer = Some(amount_to_transfer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Settle {
+            global_account: self.global_account.expect("global_account is not set"),
+            user_account: self.user_account.expect("user_account is not set"),
+            user: self.user.expect("user is not set"),
+            treasury: self.treasury.expect("treasury is not set"),
+            lock_account: self.lock_account.expect("lock_account is not set"),
+            vault: self.vault.expect("vault is not set"),
+            bot: self.bot.expect("bot is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+        let args = SettleInstructionArgs {
+            nonce: self.nonce.clone().expect("nonce is not set"),
+            amount_to_transfer: self
+                .amount_to_transfer
+                .clone()
+                .expect("amount_to_transfer is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(args, &self.__remaining_accounts)
+    }
+}
+
+/// `settle` CPI accounts.
+pub struct SettleCpiAccounts<'a, 'b> {
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub lock_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `settle` CPI instruction.
+pub struct SettleCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub global_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub treasury: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub lock_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub bot: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    /// The arguments for the instruction.
+    pub __args: SettleInstructionArgs,
+}
+
+impl<'a, 'b> SettleCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: SettleCpiAccounts<'a, 'b>,
+        args: SettleInstructionArgs,
+    ) -> Self {
+        Self {
+            __program: program,
+            global_account: accounts.global_account,
+            user_account: accounts.user_account,
+            user: accounts.user,
+            treasury: accounts.treasury,
+            lock_account: accounts.lock_account,
+            vault: accounts.vault,
+            bot: accounts.bot,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+            __args: args,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(9 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.global_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.treasury.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.lock_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.vault.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.bot.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let mut data = SettleInstructionData::new().try_to_vec().unwrap();
+        let mut args = self.__args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(10 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.global_account.clone());
+        account_infos.push(self.user_account.clone());
+        account_infos.push(self.user.clone());
+        account_infos.push(self.treasury.clone());
+        account_infos.push(self.lock_account.clone());
+        account_infos.push(self.vault.clone());
+        account_infos.push(self.bot.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Settle` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[]` global_account
+///   1. `[writable]` user_account
+///   2. `[writable]` user
+///   3. `[writable]` treasury
+///   4. `[writable]` lock_account
+///   5. `[writable]` vault
+///   6. `[signer]` bot
+///   7. `[writable, signer]` payer
+///   8. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct SettleCpiBuilder<'a, 'b> {
+    instruction: Box<SettleCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> SettleCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(SettleCpiBuilderInstruction {
+            __program: program,
+            global_account: None,
+            user_account: None,
+            user: None,
+            treasury: None,
+            lock_account: None,
+            vault: None,
+            bot: None,
+            payer: None,
+            system_program: None,
+            nonce: None,
+            amount_to_transfer: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn global_account(
+        &mut self,
+        global_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.global_account = Some(global_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user_account(
+        &mut self,
+        user_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn treasury(
+        &mut self,
+        treasury: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.treasury = Some(treasury);
+        self
+    }
+    #[inline(always)]
+    pub fn lock_account(
+        &mut self,
+        lock_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.lock_account = Some(lock_account);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn bot(&mut self, bot: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.bot = Some(bot);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn nonce(&mut self, nonce: u64) -> &mut Self {
+        self.instruction.nonce = Some(nonce);
+        self
+    }
+    #[inline(always)]
+    pub fn amount_to_transfer(&mut self, amount_to_transfer: u64) -> &mut Self {
+        self.instruction.amount_to_transfer = Some(amount_to_transfer);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let args = SettleInstructionArgs {
+            nonce: self.instruction.nonce.clone().expect("nonce is not set"),
+            amount_to_transfer: self
+                .instruction
+                .amount_to_transfer
+                .clone()
+                .expect("amount_to_transfer is not set"),
+        };
+        let instruction = SettleCpi {
+            __program: self.instruction.__program,
+
+            global_account: self
+                .instruction
+                .global_account
+                .expect("global_account is not set"),
+
+            user_account: self
+                .instruction
+                .user_account
+                .expect("user_account is not set"),
+
+            user: self.instruction.user.expect("user is not set"),
+
+            treasury: self.instruction.treasury.expect("treasury is not set"),
+
+            lock_account: self
+                .instruction
+                .lock_account
+                .expect("lock_account is not set"),
+
+            vault: self.instruction.vault.expect("vault is not set"),
+
+            bot: self.instruction.bot.expect("bot is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+            __args: args,
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct SettleCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    global_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    treasury: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    lock_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    vault: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    bot: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    nonce: Option<u64>,
+    amount_to_transfer: Option<u64>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/withdraw.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/withdraw.rs
new file mode 100644
index 0000000..011b156
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/instructions/withdraw.rs
@@ -0,0 +1,472 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+/// Accounts.
+pub struct Withdraw {
+    pub user_account: solana_program::pubkey::Pubkey,
+
+    pub user: solana_program::pubkey::Pubkey,
+
+    pub vault: solana_program::pubkey::Pubkey,
+
+    pub payer: solana_program::pubkey::Pubkey,
+
+    pub system_program: solana_program::pubkey::Pubkey,
+}
+
+impl Withdraw {
+    pub fn instruction(
+        &self,
+        args: WithdrawInstructionArgs,
+    ) -> solana_program::instruction::Instruction {
+        self.instruction_with_remaining_accounts(args, &[])
+    }
+    #[allow(clippy::vec_init_then_push)]
+    pub fn instruction_with_remaining_accounts(
+        &self,
+        args: WithdrawInstructionArgs,
+        remaining_accounts: &[solana_program::instruction::AccountMeta],
+    ) -> solana_program::instruction::Instruction {
+        let mut accounts = Vec::with_capacity(5 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user_account,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.user, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.vault, false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            self.payer, true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            self.system_program,
+            false,
+        ));
+        accounts.extend_from_slice(remaining_accounts);
+        let mut data = WithdrawInstructionData::new().try_to_vec().unwrap();
+        let mut args = args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        }
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct WithdrawInstructionData {
+    discriminator: [u8; 8],
+}
+
+impl WithdrawInstructionData {
+    pub fn new() -> Self {
+        Self {
+            discriminator: [183, 18, 70, 156, 148, 109, 161, 34],
+        }
+    }
+}
+
+impl Default for WithdrawInstructionData {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct WithdrawInstructionArgs {
+    pub amount: u64,
+}
+
+/// Instruction builder for `Withdraw`.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` user_account
+///   1. `[writable, signer]` user
+///   2. `[writable]` vault
+///   3. `[writable, signer]` payer
+///   4. `[optional]` system_program (default to `11111111111111111111111111111111`)
+#[derive(Clone, Debug, Default)]
+pub struct WithdrawBuilder {
+    user_account: Option<solana_program::pubkey::Pubkey>,
+    user: Option<solana_program::pubkey::Pubkey>,
+    vault: Option<solana_program::pubkey::Pubkey>,
+    payer: Option<solana_program::pubkey::Pubkey>,
+    system_program: Option<solana_program::pubkey::Pubkey>,
+    amount: Option<u64>,
+    __remaining_accounts: Vec<solana_program::instruction::AccountMeta>,
+}
+
+impl WithdrawBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+    #[inline(always)]
+    pub fn user_account(&mut self, user_account: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.payer = Some(payer);
+        self
+    }
+    /// `[optional account, default to '11111111111111111111111111111111']`
+    #[inline(always)]
+    pub fn system_program(&mut self, system_program: solana_program::pubkey::Pubkey) -> &mut Self {
+        self.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn amount(&mut self, amount: u64) -> &mut Self {
+        self.amount = Some(amount);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: solana_program::instruction::AccountMeta,
+    ) -> &mut Self {
+        self.__remaining_accounts.push(account);
+        self
+    }
+    /// Add additional accounts to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[solana_program::instruction::AccountMeta],
+    ) -> &mut Self {
+        self.__remaining_accounts.extend_from_slice(accounts);
+        self
+    }
+    #[allow(clippy::clone_on_copy)]
+    pub fn instruction(&self) -> solana_program::instruction::Instruction {
+        let accounts = Withdraw {
+            user_account: self.user_account.expect("user_account is not set"),
+            user: self.user.expect("user is not set"),
+            vault: self.vault.expect("vault is not set"),
+            payer: self.payer.expect("payer is not set"),
+            system_program: self
+                .system_program
+                .unwrap_or(solana_program::pubkey!("11111111111111111111111111111111")),
+        };
+        let args = WithdrawInstructionArgs {
+            amount: self.amount.clone().expect("amount is not set"),
+        };
+
+        accounts.instruction_with_remaining_accounts(args, &self.__remaining_accounts)
+    }
+}
+
+/// `withdraw` CPI accounts.
+pub struct WithdrawCpiAccounts<'a, 'b> {
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+}
+
+/// `withdraw` CPI instruction.
+pub struct WithdrawCpi<'a, 'b> {
+    /// The program to invoke.
+    pub __program: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user_account: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub user: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub vault: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub payer: &'b solana_program::account_info::AccountInfo<'a>,
+
+    pub system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    /// The arguments for the instruction.
+    pub __args: WithdrawInstructionArgs,
+}
+
+impl<'a, 'b> WithdrawCpi<'a, 'b> {
+    pub fn new(
+        program: &'b solana_program::account_info::AccountInfo<'a>,
+        accounts: WithdrawCpiAccounts<'a, 'b>,
+        args: WithdrawInstructionArgs,
+    ) -> Self {
+        Self {
+            __program: program,
+            user_account: accounts.user_account,
+            user: accounts.user,
+            vault: accounts.vault,
+            payer: accounts.payer,
+            system_program: accounts.system_program,
+            __args: args,
+        }
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], &[])
+    }
+    #[inline(always)]
+    pub fn invoke_with_remaining_accounts(
+        &self,
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(&[], remaining_accounts)
+    }
+    #[inline(always)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed_with_remaining_accounts(signers_seeds, &[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed_with_remaining_accounts(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+        remaining_accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let mut accounts = Vec::with_capacity(5 + remaining_accounts.len());
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user_account.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.user.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.vault.key,
+            false,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new(
+            *self.payer.key,
+            true,
+        ));
+        accounts.push(solana_program::instruction::AccountMeta::new_readonly(
+            *self.system_program.key,
+            false,
+        ));
+        remaining_accounts.iter().for_each(|remaining_account| {
+            accounts.push(solana_program::instruction::AccountMeta {
+                pubkey: *remaining_account.0.key,
+                is_signer: remaining_account.1,
+                is_writable: remaining_account.2,
+            })
+        });
+        let mut data = WithdrawInstructionData::new().try_to_vec().unwrap();
+        let mut args = self.__args.try_to_vec().unwrap();
+        data.append(&mut args);
+
+        let instruction = solana_program::instruction::Instruction {
+            program_id: crate::BALANCE_PAYMENT_ID,
+            accounts,
+            data,
+        };
+        let mut account_infos = Vec::with_capacity(6 + remaining_accounts.len());
+        account_infos.push(self.__program.clone());
+        account_infos.push(self.user_account.clone());
+        account_infos.push(self.user.clone());
+        account_infos.push(self.vault.clone());
+        account_infos.push(self.payer.clone());
+        account_infos.push(self.system_program.clone());
+        remaining_accounts
+            .iter()
+            .for_each(|remaining_account| account_infos.push(remaining_account.0.clone()));
+
+        if signers_seeds.is_empty() {
+            solana_program::program::invoke(&instruction, &account_infos)
+        } else {
+            solana_program::program::invoke_signed(&instruction, &account_infos, signers_seeds)
+        }
+    }
+}
+
+/// Instruction builder for `Withdraw` via CPI.
+///
+/// ### Accounts:
+///
+///   0. `[writable]` user_account
+///   1. `[writable, signer]` user
+///   2. `[writable]` vault
+///   3. `[writable, signer]` payer
+///   4. `[]` system_program
+#[derive(Clone, Debug)]
+pub struct WithdrawCpiBuilder<'a, 'b> {
+    instruction: Box<WithdrawCpiBuilderInstruction<'a, 'b>>,
+}
+
+impl<'a, 'b> WithdrawCpiBuilder<'a, 'b> {
+    pub fn new(program: &'b solana_program::account_info::AccountInfo<'a>) -> Self {
+        let instruction = Box::new(WithdrawCpiBuilderInstruction {
+            __program: program,
+            user_account: None,
+            user: None,
+            vault: None,
+            payer: None,
+            system_program: None,
+            amount: None,
+            __remaining_accounts: Vec::new(),
+        });
+        Self { instruction }
+    }
+    #[inline(always)]
+    pub fn user_account(
+        &mut self,
+        user_account: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.user_account = Some(user_account);
+        self
+    }
+    #[inline(always)]
+    pub fn user(&mut self, user: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.user = Some(user);
+        self
+    }
+    #[inline(always)]
+    pub fn vault(&mut self, vault: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.vault = Some(vault);
+        self
+    }
+    #[inline(always)]
+    pub fn payer(&mut self, payer: &'b solana_program::account_info::AccountInfo<'a>) -> &mut Self {
+        self.instruction.payer = Some(payer);
+        self
+    }
+    #[inline(always)]
+    pub fn system_program(
+        &mut self,
+        system_program: &'b solana_program::account_info::AccountInfo<'a>,
+    ) -> &mut Self {
+        self.instruction.system_program = Some(system_program);
+        self
+    }
+    #[inline(always)]
+    pub fn amount(&mut self, amount: u64) -> &mut Self {
+        self.instruction.amount = Some(amount);
+        self
+    }
+    /// Add an additional account to the instruction.
+    #[inline(always)]
+    pub fn add_remaining_account(
+        &mut self,
+        account: &'b solana_program::account_info::AccountInfo<'a>,
+        is_writable: bool,
+        is_signer: bool,
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .push((account, is_writable, is_signer));
+        self
+    }
+    /// Add additional accounts to the instruction.
+    ///
+    /// Each account is represented by a tuple of the `AccountInfo`, a `bool` indicating whether the account is writable or not,
+    /// and a `bool` indicating whether the account is a signer or not.
+    #[inline(always)]
+    pub fn add_remaining_accounts(
+        &mut self,
+        accounts: &[(
+            &'b solana_program::account_info::AccountInfo<'a>,
+            bool,
+            bool,
+        )],
+    ) -> &mut Self {
+        self.instruction
+            .__remaining_accounts
+            .extend_from_slice(accounts);
+        self
+    }
+    #[inline(always)]
+    pub fn invoke(&self) -> solana_program::entrypoint::ProgramResult {
+        self.invoke_signed(&[])
+    }
+    #[allow(clippy::clone_on_copy)]
+    #[allow(clippy::vec_init_then_push)]
+    pub fn invoke_signed(
+        &self,
+        signers_seeds: &[&[&[u8]]],
+    ) -> solana_program::entrypoint::ProgramResult {
+        let args = WithdrawInstructionArgs {
+            amount: self.instruction.amount.clone().expect("amount is not set"),
+        };
+        let instruction = WithdrawCpi {
+            __program: self.instruction.__program,
+
+            user_account: self
+                .instruction
+                .user_account
+                .expect("user_account is not set"),
+
+            user: self.instruction.user.expect("user is not set"),
+
+            vault: self.instruction.vault.expect("vault is not set"),
+
+            payer: self.instruction.payer.expect("payer is not set"),
+
+            system_program: self
+                .instruction
+                .system_program
+                .expect("system_program is not set"),
+            __args: args,
+        };
+        instruction.invoke_signed_with_remaining_accounts(
+            signers_seeds,
+            &self.instruction.__remaining_accounts,
+        )
+    }
+}
+
+#[derive(Clone, Debug)]
+struct WithdrawCpiBuilderInstruction<'a, 'b> {
+    __program: &'b solana_program::account_info::AccountInfo<'a>,
+    user_account: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    user: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    vault: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    payer: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    system_program: Option<&'b solana_program::account_info::AccountInfo<'a>>,
+    amount: Option<u64>,
+    /// Additional instruction accounts `(AccountInfo, is_writable, is_signer)`.
+    __remaining_accounts: Vec<(
+        &'b solana_program::account_info::AccountInfo<'a>,
+        bool,
+        bool,
+    )>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/mod.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/mod.rs
new file mode 100644
index 0000000..6050d86
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/mod.rs
@@ -0,0 +1,14 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+pub mod accounts;
+pub mod errors;
+pub mod instructions;
+pub mod programs;
+pub mod types;
+
+pub(crate) use programs::*;
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/programs.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/programs.rs
new file mode 100644
index 0000000..3d9abc8
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/programs.rs
@@ -0,0 +1,11 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use solana_program::{pubkey, pubkey::Pubkey};
+
+/// `balance_payment` program ID.
+pub const BALANCE_PAYMENT_ID: Pubkey = pubkey!("GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9");
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/types/e_d25519_recover_info.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/types/e_d25519_recover_info.rs
new file mode 100644
index 0000000..ebaa398
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/types/e_d25519_recover_info.rs
@@ -0,0 +1,19 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+use borsh::BorshDeserialize;
+use borsh::BorshSerialize;
+
+#[derive(BorshSerialize, BorshDeserialize, Clone, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct ED25519RecoverInfo {
+    #[cfg_attr(feature = "serde", serde(with = "serde_with::As::<serde_with::Bytes>"))]
+    pub signature: [u8; 64],
+    #[cfg_attr(feature = "serde", serde(with = "serde_with::As::<serde_with::Bytes>"))]
+    pub payload: [u8; 64],
+    pub deadline: i64,
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/generated/types/mod.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/types/mod.rs
new file mode 100644
index 0000000..1d11556
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/generated/types/mod.rs
@@ -0,0 +1,10 @@
+//! This code was AUTOGENERATED using the codama library.
+//! Please DO NOT EDIT THIS FILE, instead use visitors
+//! to add features, then rerun codama to update it.
+//!
+//! <https://github.com/codama-idl/codama>
+//!
+
+pub(crate) mod r#e_d25519_recover_info;
+
+pub use self::r#e_d25519_recover_info::*;
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/lib.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/lib.rs
new file mode 100644
index 0000000..92979fb
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/lib.rs
@@ -0,0 +1,293 @@
+#[allow(clippy::all)]
+#[allow(warnings, unused)]
+#[rustfmt::skip]
+mod generated;
+
+mod error;
+mod verify;
+
+use std::time::Duration;
+use std::time::SystemTime;
+use std::time::UNIX_EPOCH;
+
+pub use error::Error;
+use generated::accounts::GlobalAccount;
+use generated::accounts::UserAccount;
+use generated::instructions::Lock;
+use generated::instructions::LockInstructionArgs;
+use generated::instructions::Pay;
+use generated::instructions::PayInstructionArgs;
+use generated::instructions::Settle;
+use generated::instructions::SettleInstructionArgs;
+use generated::programs::BALANCE_PAYMENT_ID;
+use generated::types::ED25519RecoverInfo;
+use solana_client::nonblocking::rpc_client::RpcClient;
+use solana_program::pubkey::Pubkey;
+use solana_sdk::bs58;
+use solana_sdk::commitment_config::CommitmentConfig;
+use solana_sdk::keccak;
+use solana_sdk::signature::Keypair;
+use solana_sdk::signer::EncodableKey;
+use solana_sdk::signer::Signer;
+use solana_sdk::system_program;
+use solana_sdk::transaction::Transaction;
+use verify::verify_signature;
+
+const SIGN_MESSAGE_PREFIX: &[u8; 31] = b"DePHY vending machine/Example:\n";
+
+fn get_client(url: &str) -> RpcClient {
+    let timeout = Duration::from_secs(10);
+    let commitment_config = CommitmentConfig::processed();
+    let confirm_transaction_initial_timeout = Duration::from_secs(10);
+    RpcClient::new_with_timeouts_and_commitment(
+        url.to_string(),
+        timeout,
+        commitment_config,
+        confirm_transaction_initial_timeout,
+    )
+}
+
+pub async fn check_eligible(
+    rpc_url: &str,
+    user: &str,
+    nonce: u64,
+    amount: u64,
+    recover_info: &str,
+) -> Result<bool, Error> {
+    let user: Pubkey = user.parse()?;
+    let recover_info: ED25519RecoverInfo = serde_json::from_str(recover_info)?;
+
+    let client = get_client(rpc_url);
+
+    let user_account_pubkey =
+        Pubkey::find_program_address(&[b"USER", user.as_ref()], &BALANCE_PAYMENT_ID).0;
+    let user_account_data = client.get_account_data(&user_account_pubkey).await?;
+    let user_account = UserAccount::from_bytes(&user_account_data)?;
+
+    // 0. check nonce
+    if user_account.nonce != nonce {
+        tracing::error!(
+            "Nonce mismatch: expected {}, got {}",
+            nonce,
+            user_account.nonce
+        );
+        return Ok(false);
+    }
+
+    // 1. concat message
+    let message = {
+        let mut data = recover_info.payload.to_vec();
+        data.extend_from_slice(&user_account.nonce.to_le_bytes());
+        data.extend_from_slice(&recover_info.deadline.to_le_bytes());
+        data
+    };
+
+    // 2. calc message hash
+    let message_hash = {
+        let mut hasher = keccak::Hasher::default();
+        hasher.hash(&message);
+        hasher.result().to_bytes()
+    };
+
+    // 3. generate digest
+    let digest = {
+        let mut data = SIGN_MESSAGE_PREFIX.to_vec();
+        data.extend_from_slice(bs58::encode(&message_hash).into_string().as_bytes());
+        data
+    };
+
+    // 4. verify signature
+    let valid = verify_signature(&user, &recover_info.signature, &digest)
+        .map_err(|e| {
+            tracing::error!("Signature verification failed: {:?}", e);
+            e
+        })
+        .is_ok();
+
+    if !valid {
+        tracing::error!("Invalid signature");
+        return Ok(false);
+    }
+
+    // 5. check signature expiration
+    let current_timestamp = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_secs() as i64;
+
+    if current_timestamp >= recover_info.deadline {
+        tracing::error!("Signature expired: deadline {}", recover_info.deadline);
+        return Ok(false);
+    }
+
+    // 6. check user vault balance
+    let vault_pubkey =
+        Pubkey::find_program_address(&[b"VAULT", user.as_ref()], &BALANCE_PAYMENT_ID).0;
+    let vault_balance = client.get_account(&vault_pubkey).await?.lamports;
+
+    if vault_balance - user_account.locked_amount < amount {
+        tracing::error!(
+            "Insufficient funds: available {}, required {}",
+            vault_balance - user_account.locked_amount,
+            amount
+        );
+        return Ok(false);
+    }
+
+    tracing::info!("User is eligible");
+    Ok(true)
+}
+
+pub async fn lock(
+    rpc_url: &str,
+    keypair_path: &str,
+    user: &str,
+    amount: u64,
+    recover_info: &str,
+) -> Result<String, Error> {
+    let user: Pubkey = user.parse()?;
+    let recover_info: ED25519RecoverInfo = serde_json::from_str(recover_info)?;
+
+    let bot = Keypair::read_from_file(keypair_path).map_err(Error::KeypairReadFailed)?;
+    let payer = bot.insecure_clone();
+
+    let client = get_client(rpc_url);
+
+    let user_account_pubkey =
+        Pubkey::find_program_address(&[b"USER", user.as_ref()], &BALANCE_PAYMENT_ID).0;
+    let user_account_data = client.get_account_data(&user_account_pubkey).await?;
+    let user_account = UserAccount::from_bytes(&user_account_data)?;
+
+    let lock_instruction = Lock {
+        global_account: Pubkey::find_program_address(&[b"GLOBAL"], &BALANCE_PAYMENT_ID).0,
+        user_account: user_account_pubkey,
+        user,
+        lock_account: Pubkey::find_program_address(
+            &[b"LOCK", user.as_ref(), &user_account.nonce.to_le_bytes()],
+            &BALANCE_PAYMENT_ID,
+        )
+        .0,
+        vault: Pubkey::find_program_address(&[b"VAULT", user.as_ref()], &BALANCE_PAYMENT_ID).0,
+        bot: bot.pubkey(),
+        payer: payer.pubkey(),
+        system_program: system_program::id(),
+    };
+
+    let latest_block = client.get_latest_blockhash().await?;
+
+    let transaction = Transaction::new_signed_with_payer(
+        &[lock_instruction.instruction(LockInstructionArgs {
+            amount,
+            recover_info,
+        })],
+        Some(&payer.pubkey()),
+        &[&bot, &payer],
+        latest_block,
+    );
+
+    let signature = client.send_and_confirm_transaction(&transaction).await?;
+
+    Ok(signature.to_string())
+}
+
+pub async fn settle(
+    rpc_url: &str,
+    keypair_path: &str,
+    user: &str,
+    nonce: u64,
+    amount_to_transfer: u64,
+) -> Result<String, Error> {
+    let user: Pubkey = user.parse()?;
+
+    let bot = Keypair::read_from_file(keypair_path).map_err(Error::KeypairReadFailed)?;
+    let payer = bot.insecure_clone();
+
+    let client = get_client(rpc_url);
+
+    let global_account_pubkey = Pubkey::find_program_address(&[b"GLOBAL"], &BALANCE_PAYMENT_ID).0;
+    let global_account_data = client.get_account_data(&global_account_pubkey).await?;
+    let global_account: GlobalAccount = GlobalAccount::from_bytes(&global_account_data)?;
+    let treasury = global_account.treasury;
+
+    let latest_block = client.get_latest_blockhash().await?;
+
+    let settle_instruction = Settle {
+        global_account: global_account_pubkey,
+        user_account: Pubkey::find_program_address(&[b"USER", user.as_ref()], &BALANCE_PAYMENT_ID)
+            .0,
+        user,
+        treasury,
+        lock_account: Pubkey::find_program_address(
+            &[b"LOCK", user.as_ref(), &nonce.to_le_bytes()],
+            &BALANCE_PAYMENT_ID,
+        )
+        .0,
+        vault: Pubkey::find_program_address(&[b"VAULT", user.as_ref()], &BALANCE_PAYMENT_ID).0,
+        bot: bot.pubkey(),
+        payer: payer.pubkey(),
+        system_program: system_program::id(),
+    };
+
+    let transaction = Transaction::new_signed_with_payer(
+        &[settle_instruction.instruction(SettleInstructionArgs {
+            nonce,
+            amount_to_transfer,
+        })],
+        Some(&payer.pubkey()),
+        &[&bot, &payer],
+        latest_block,
+    );
+
+    let signature = client.send_and_confirm_transaction(&transaction).await?;
+
+    Ok(signature.to_string())
+}
+
+pub async fn pay(
+    rpc_url: &str,
+    keypair_path: &str,
+    user: &str,
+    amount_to_transfer: u64,
+    recover_info: &str,
+) -> Result<String, Error> {
+    let user: Pubkey = user.parse()?;
+    let recover_info: ED25519RecoverInfo = serde_json::from_str(recover_info)?;
+
+    let bot = Keypair::read_from_file(keypair_path).map_err(Error::KeypairReadFailed)?;
+    let payer = bot.insecure_clone();
+
+    let client = get_client(rpc_url);
+
+    let global_account_pubkey = Pubkey::find_program_address(&[b"GLOBAL"], &BALANCE_PAYMENT_ID).0;
+    let global_account_data = client.get_account_data(&global_account_pubkey).await?;
+    let global_account: GlobalAccount = GlobalAccount::from_bytes(&global_account_data)?;
+    let treasury = global_account.treasury;
+
+    let latest_block = client.get_latest_blockhash().await?;
+
+    let pay_instruction = Pay {
+        global_account: global_account_pubkey,
+        user_account: Pubkey::find_program_address(&[b"USER", user.as_ref()], &BALANCE_PAYMENT_ID)
+            .0,
+        user,
+        treasury,
+        vault: Pubkey::find_program_address(&[b"VAULT", user.as_ref()], &BALANCE_PAYMENT_ID).0,
+        bot: bot.pubkey(),
+        payer: payer.pubkey(),
+        system_program: system_program::id(),
+    };
+
+    let transaction = Transaction::new_signed_with_payer(
+        &[pay_instruction.instruction(PayInstructionArgs {
+            amount_to_transfer,
+            recover_info,
+        })],
+        Some(&payer.pubkey()),
+        &[&bot, &payer],
+        latest_block,
+    );
+
+    let signature = client.send_and_confirm_transaction(&transaction).await?;
+
+    Ok(signature.to_string())
+}
diff --git a/dephy-vending_machine-examples/balance-payment-sdk/src/verify.rs b/dephy-vending_machine-examples/balance-payment-sdk/src/verify.rs
new file mode 100644
index 0000000..453165e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment-sdk/src/verify.rs
@@ -0,0 +1,61 @@
+use arrayref::array_ref;
+use curve25519_dalek::scalar::Scalar;
+use sha2::Digest;
+use solana_program::pubkey::Pubkey;
+use solana_zk_token_sdk::curve25519::edwards::multiply_edwards;
+use solana_zk_token_sdk::curve25519::edwards::subtract_edwards;
+use solana_zk_token_sdk::curve25519::edwards::validate_edwards;
+use solana_zk_token_sdk::curve25519::edwards::PodEdwardsPoint;
+use solana_zk_token_sdk::curve25519::scalar::PodScalar;
+
+use crate::Error;
+
+// funny number
+const EDWARDS_BASE_POINT: PodEdwardsPoint = PodEdwardsPoint([
+    0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+    0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+]);
+
+pub fn verify_signature(
+    pubkey: &Pubkey,
+    signature: &[u8; 64],
+    message: &[u8],
+) -> Result<bool, Error> {
+    let a = PodEdwardsPoint(pubkey.to_bytes());
+    let r = PodEdwardsPoint(*array_ref![signature, 0, 32]);
+    if !validate_edwards(&a) {
+        return Err(Error::SignatureVerificationFailed(
+            "Pubkey is not a valid EdwardsPoint".to_string(),
+        ));
+    }
+    if !validate_edwards(&r) {
+        return Err(Error::SignatureVerificationFailed(
+            "Signature R is not a valid EdwardsPoint".to_string(),
+        ));
+    }
+
+    let s = array_ref![signature, 32, 32];
+    let s_scalar = Scalar::from_bytes_mod_order(*s);
+    let s_scalar = PodScalar(s_scalar.to_bytes());
+
+    let mut hasher = sha2::Sha512::new();
+    // R || A || M
+    hasher.update(r.0);
+    hasher.update(a.0);
+    hasher.update(message);
+    let hash_bytes = hasher.finalize();
+    let hash_array = array_ref![hash_bytes, 0, 64];
+    let h_scalar = Scalar::from_bytes_mod_order_wide(hash_array);
+    let h_scalar = PodScalar(h_scalar.to_bytes());
+
+    let s_b = multiply_edwards(&s_scalar, &EDWARDS_BASE_POINT).ok_or(
+        Error::SignatureVerificationFailed("Failed to multiply S*B".to_string()),
+    )?;
+    let h_a = multiply_edwards(&h_scalar, &a).ok_or(Error::SignatureVerificationFailed(
+        "Failed to multiply H*A".to_string(),
+    ))?;
+    let r_prime = subtract_edwards(&s_b, &h_a).ok_or(Error::SignatureVerificationFailed(
+        "Failed to subtract HA from SB".to_string(),
+    ))?;
+    Ok(r_prime == r)
+}
diff --git a/dephy-vending_machine-examples/balance-payment/Anchor.toml b/dephy-vending_machine-examples/balance-payment/Anchor.toml
new file mode 100644
index 0000000..7eb2421
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/Anchor.toml
@@ -0,0 +1,19 @@
+[toolchain]
+
+[features]
+resolution = true
+skip-lint = false
+
+[programs.localnet]
+balance_payment = "GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9"
+
+[registry]
+url = "https://api.apr.dev"
+
+[provider]
+cluster = "Localnet"
+wallet = "~/.config/solana/id.json"
+
+[scripts]
+cli = "bun run -b scripts/cli.ts"
+test = "bun run -b ts-mocha -p ./tsconfig.json -t 1000000 tests/**/*.ts"
diff --git a/dephy-vending_machine-examples/balance-payment/Cargo.lock b/dephy-vending_machine-examples/balance-payment/Cargo.lock
new file mode 100644
index 0000000..0afd5be
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/Cargo.lock
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diff --git a/dephy-vending_machine-examples/balance-payment/Cargo.toml b/dephy-vending_machine-examples/balance-payment/Cargo.toml
new file mode 100644
index 0000000..68da9dd
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/Cargo.toml
@@ -0,0 +1,13 @@
+[workspace]
+members = ["programs/*"]
+resolver = "2"
+
+[profile.release]
+overflow-checks = true
+lto = "fat"
+codegen-units = 1
+
+[profile.release.build-override]
+opt-level = 3
+incremental = false
+codegen-units = 1
diff --git a/dephy-vending_machine-examples/balance-payment/README.md b/dephy-vending_machine-examples/balance-payment/README.md
new file mode 100644
index 0000000..ceb2a95
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/README.md
@@ -0,0 +1,96 @@
+# Balance Payment Program
+
+This project is a Solana program built using the Anchor framework.
+It allows users to deposit, withdraw, lock, and settle funds, as well as make payments to a treasury account.
+The program is designed to be used in conjunction with a bot and a treasury account, which are managed by an authority.
+
+## Getting Started
+
+### Prerequisites
+
+Before you begin, ensure you have the following installed:
+
+- [Node.js](https://nodejs.org) (v20 or higher)
+- [Bun](https://bun.sh/docs/installation)
+- [Solana & Anchor](https://solana.com/docs/intro/installation)
+
+### Installation
+
+```bash
+bun install
+```
+
+## Compiling the Program
+
+To compile the program, run:
+
+```bash
+anchor build
+```
+
+This command compiles the Solana program and generates the necessary artifacts.
+
+## Deploying the Program Locally
+
+To deploy the program to a local Solana validator, follow these steps:
+
+1. **Start a local Solana validator:**
+
+```bash
+solana-test-validator --reset
+```
+
+This command starts a local Solana blockchain instance.
+
+2. **Ensure your Solana CLI is configured to use the local validator:**
+
+```bash
+solana config set --url http://localhost:8899
+```
+
+3. **Airdrop SOL to your local wallet:**
+
+```bash
+solana airdrop 2
+solana airdrop 2 9nyhqLqmbWoUuNXA1XCVnEqiS9UWvxFYa1yynVVFzR4D
+```
+
+4. **Deploy the program to the local validator:**
+
+```bash
+solana program deploy ./target/deploy/balance_payment.so --program-id ./programs/balance-payment/keypair.json
+```
+
+This command will deploy the program to the local Solana validator and output the program ID.
+
+# Initialize the Program
+
+Initializes the program with an authority, treasury, and bot.
+
+```bash
+anchor run cli -- initialize --authority <AUTHORITY_PUBKEY> --treasury <TREASURY_PUBKEY> --bot 9nyhqLqmbWoUuNXA1XCVnEqiS9UWvxFYa1yynVVFzR4D
+```
+
+- `--authority`: The public key of the authority.
+- `--treasury`: The public key of the treasury account.
+- `--bot`: The public key of the bot account.
+
+# App Demo
+
+The `app` folder contains a demo application that interacts with the Balance Payment program. To run the demo:
+
+- Navigate to the `app` directory:
+```bash
+cd app
+```
+- Install dependencies:
+```bash
+bun install
+```
+- Start the development server:
+```bash
+bun run dev
+```
+- Open your browser and navigate to `http://localhost:5173` to view the demo.
+
+This demo provides a user-friendly interface to interact with the Balance Payment program, enabling users to manage funds and simulate charging sessions.
diff --git a/dephy-vending_machine-examples/balance-payment/app/.env.example b/dephy-vending_machine-examples/balance-payment/app/.env.example
new file mode 100644
index 0000000..600ff62
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/.env.example
@@ -0,0 +1,2 @@
+VITE_RELAY_ENDPOINT=
+VITE_NETWORK=
diff --git a/dephy-vending_machine-examples/balance-payment/app/.gitignore b/dephy-vending_machine-examples/balance-payment/app/.gitignore
new file mode 100644
index 0000000..33c24ce
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/.gitignore
@@ -0,0 +1,25 @@
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?
+/tmp
diff --git a/dephy-vending_machine-examples/balance-payment/app/.prettierignore b/dephy-vending_machine-examples/balance-payment/app/.prettierignore
new file mode 100644
index 0000000..8d646b0
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/.prettierignore
@@ -0,0 +1,8 @@
+# Add files here to ignore them from prettier formatting
+/.yarn
+/coverage
+/dist
+/tmp
+package-lock.json
+pnpm-lock.yaml
+yarn.lock
diff --git a/dephy-vending_machine-examples/balance-payment/app/.prettierrc b/dephy-vending_machine-examples/balance-payment/app/.prettierrc
new file mode 100644
index 0000000..f8fb56b
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/.prettierrc
@@ -0,0 +1,7 @@
+{
+  "singleQuote": true,
+  "printWidth": 120,
+  "semi": false,
+  "trailingComma": "all",
+  "arrowParens": "always"
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/LICENSE b/dephy-vending_machine-examples/balance-payment/app/LICENSE
new file mode 100644
index 0000000..f79b9ea
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022-2024 Solana Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/dephy-vending_machine-examples/balance-payment/app/README.md b/dephy-vending_machine-examples/balance-payment/app/README.md
new file mode 100644
index 0000000..7726ada
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/README.md
@@ -0,0 +1,7 @@
+Balance payment dApp
+====
+
+## Run
+
+- `bun i`
+- `bun run dev`
diff --git a/dephy-vending_machine-examples/balance-payment/app/eslint.config.js b/dephy-vending_machine-examples/balance-payment/app/eslint.config.js
new file mode 100644
index 0000000..05c6758
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/eslint.config.js
@@ -0,0 +1,25 @@
+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+
+export default tseslint.config(
+  { ignores: ['dist'] },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['**/*.{ts,tsx}'],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+    },
+    plugins: {
+      'react-hooks': reactHooks,
+      'react-refresh': reactRefresh,
+    },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      'react-refresh/only-export-components': ['warn', { allowConstantExport: true }],
+    },
+  },
+)
diff --git a/dephy-vending_machine-examples/balance-payment/app/index.html b/dephy-vending_machine-examples/balance-payment/app/index.html
new file mode 100644
index 0000000..a5f3d4e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/index.html
@@ -0,0 +1,13 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Balance Payment</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
diff --git a/dephy-vending_machine-examples/balance-payment/app/package.json b/dephy-vending_machine-examples/balance-payment/app/package.json
new file mode 100644
index 0000000..09f76de
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/package.json
@@ -0,0 +1,58 @@
+{
+  "name": "template-react-vite-tailwind-counter",
+  "description": "React + Vite + Tailwind + Anchor Counter program",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.31.0",
+    "@noble/hashes": "^1.7.0",
+    "@solana/spl-token": "^0.4.8",
+    "@solana/wallet-adapter-base": "^0.9.23",
+    "@solana/wallet-adapter-react": "^0.15.35",
+    "@solana/wallet-adapter-react-ui": "^0.9.35",
+    "@solana/web3.js": "^1.95.3",
+    "@tabler/icons-react": "^3.15.0",
+    "@tanstack/react-query": "^5.55.2",
+    "bs58": "^6.0.0",
+    "daisyui": "^4.12.10",
+    "jotai": "^2.9.3",
+    "keccak": "^3.0.4",
+    "node-stdlib-browser": "^1.2.0",
+    "nostr-tools": "^2.10.4",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-hot-toast": "^2.4.1",
+    "react-router": "^6.26.1",
+    "react-router-dom": "^6.26.1",
+    "tailwindcss": "^3.4.10",
+    "uuid": "^11.0.5"
+  },
+  "devDependencies": {
+    "@esbuild-plugins/node-globals-polyfill": "^0.2.3",
+    "@eslint/js": "^9.9.0",
+    "@types/jest": "^29.5.13",
+    "@types/keccak": "^3.0.5",
+    "@types/react": "^18.3.3",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.1",
+    "eslint": "^9.9.0",
+    "eslint-plugin-react-hooks": "^5.1.0-rc.0",
+    "eslint-plugin-react-refresh": "^0.4.9",
+    "globals": "^15.9.0",
+    "jest": "^29.7.0",
+    "prettier": "^3.3.3",
+    "ts-jest": "^29.2.5",
+    "typescript": "^5.5.3",
+    "typescript-eslint": "^8.0.1",
+    "vite": "^5.4.1",
+    "vite-plugin-node-polyfills": "^0.22.0",
+    "vite-tsconfig-paths": "^5.0.1"
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/postcss.config.mjs b/dephy-vending_machine-examples/balance-payment/app/postcss.config.mjs
new file mode 100644
index 0000000..0dc456a
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/postcss.config.mjs
@@ -0,0 +1,8 @@
+/** @type {import('postcss-load-config').Config} */
+const config = {
+  plugins: {
+    tailwindcss: {},
+  },
+}
+
+export default config
diff --git a/dephy-vending_machine-examples/balance-payment/app/public/logo.png b/dephy-vending_machine-examples/balance-payment/app/public/logo.png
new file mode 100644
index 0000000..404e288
Binary files /dev/null and b/dephy-vending_machine-examples/balance-payment/app/public/logo.png differ
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/anchor/balance_payment.json b/dephy-vending_machine-examples/balance-payment/app/src/anchor/balance_payment.json
new file mode 100644
index 0000000..976d2f6
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/anchor/balance_payment.json
@@ -0,0 +1,818 @@
+{
+  "address": "GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9",
+  "metadata": {
+    "name": "balance_payment",
+    "version": "0.1.0",
+    "spec": "0.1.0",
+    "description": "Created with Anchor"
+  },
+  "instructions": [
+    {
+      "name": "deposit",
+      "discriminator": [
+        242,
+        35,
+        198,
+        137,
+        82,
+        225,
+        242,
+        182
+      ],
+      "accounts": [
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "initialize",
+      "discriminator": [
+        175,
+        175,
+        109,
+        31,
+        13,
+        152,
+        155,
+        237
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority"
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "lock",
+      "discriminator": [
+        21,
+        19,
+        208,
+        43,
+        237,
+        62,
+        255,
+        87
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "lock_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "account",
+                "path": "user_account.nonce",
+                "account": "UserAccount"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "recover_info",
+          "type": {
+            "defined": {
+              "name": "ED25519RecoverInfo"
+            }
+          }
+        },
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "register",
+      "discriminator": [
+        211,
+        124,
+        67,
+        15,
+        211,
+        194,
+        178,
+        240
+      ],
+      "accounts": [
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "set_bot",
+      "discriminator": [
+        136,
+        185,
+        99,
+        236,
+        200,
+        131,
+        204,
+        118
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "set_treasury",
+      "discriminator": [
+        57,
+        97,
+        196,
+        95,
+        195,
+        206,
+        106,
+        136
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "settle",
+      "discriminator": [
+        175,
+        42,
+        185,
+        87,
+        144,
+        131,
+        102,
+        212
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "treasury",
+          "writable": true
+        },
+        {
+          "name": "lock_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "arg",
+                "path": "nonce"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "_nonce",
+          "type": "u64"
+        },
+        {
+          "name": "amount_to_transfer",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "withdraw",
+      "discriminator": [
+        183,
+        18,
+        70,
+        156,
+        148,
+        109,
+        161,
+        34
+      ],
+      "accounts": [
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    }
+  ],
+  "accounts": [
+    {
+      "name": "GlobalAccount",
+      "discriminator": [
+        129,
+        105,
+        124,
+        171,
+        189,
+        42,
+        108,
+        69
+      ]
+    },
+    {
+      "name": "LockAccount",
+      "discriminator": [
+        223,
+        64,
+        71,
+        124,
+        255,
+        86,
+        118,
+        192
+      ]
+    },
+    {
+      "name": "UserAccount",
+      "discriminator": [
+        211,
+        33,
+        136,
+        16,
+        186,
+        110,
+        242,
+        127
+      ]
+    }
+  ],
+  "errors": [
+    {
+      "code": 6000,
+      "name": "Unauthorized",
+      "msg": "Unauthorized access."
+    },
+    {
+      "code": 6001,
+      "name": "InsufficientFunds",
+      "msg": "Insufficient funds."
+    },
+    {
+      "code": 6002,
+      "name": "SignatureFormatInvalid",
+      "msg": "The signature format or recovery ID is incorrect."
+    },
+    {
+      "code": 6003,
+      "name": "SignatureRecoveryFailed",
+      "msg": "Failed to recover public key from signature."
+    },
+    {
+      "code": 6004,
+      "name": "SignatureMismatch",
+      "msg": "The recovered public key does not match the user's public key."
+    },
+    {
+      "code": 6005,
+      "name": "SignatureExpired",
+      "msg": "The signature is expired."
+    }
+  ],
+  "types": [
+    {
+      "name": "ED25519RecoverInfo",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "signature",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "payload",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "deadline",
+            "type": "i64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "GlobalAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "authority",
+            "type": "pubkey"
+          },
+          {
+            "name": "bot",
+            "type": "pubkey"
+          },
+          {
+            "name": "treasury",
+            "type": "pubkey"
+          }
+        ]
+      }
+    },
+    {
+      "name": "LockAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "amount",
+            "type": "u64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "UserAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "nonce",
+            "type": "u64"
+          },
+          {
+            "name": "locked_amount",
+            "type": "u64"
+          },
+          {
+            "name": "vault",
+            "type": "pubkey"
+          }
+        ]
+      }
+    }
+  ]
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/anchor/balance_payment.ts b/dephy-vending_machine-examples/balance-payment/app/src/anchor/balance_payment.ts
new file mode 100644
index 0000000..80fbf2b
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/anchor/balance_payment.ts
@@ -0,0 +1,824 @@
+/**
+ * Program IDL in camelCase format in order to be used in JS/TS.
+ *
+ * Note that this is only a type helper and is not the actual IDL. The original
+ * IDL can be found at `target/idl/balance_payment.json`.
+ */
+export type BalancePayment = {
+  "address": "GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9",
+  "metadata": {
+    "name": "balancePayment",
+    "version": "0.1.0",
+    "spec": "0.1.0",
+    "description": "Created with Anchor"
+  },
+  "instructions": [
+    {
+      "name": "deposit",
+      "discriminator": [
+        242,
+        35,
+        198,
+        137,
+        82,
+        225,
+        242,
+        182
+      ],
+      "accounts": [
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "initialize",
+      "discriminator": [
+        175,
+        175,
+        109,
+        31,
+        13,
+        152,
+        155,
+        237
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority"
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "lock",
+      "discriminator": [
+        21,
+        19,
+        208,
+        43,
+        237,
+        62,
+        255,
+        87
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "lockAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "account",
+                "path": "user_account.nonce",
+                "account": "userAccount"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "recoverInfo",
+          "type": {
+            "defined": {
+              "name": "ed25519RecoverInfo"
+            }
+          }
+        },
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "register",
+      "discriminator": [
+        211,
+        124,
+        67,
+        15,
+        211,
+        194,
+        178,
+        240
+      ],
+      "accounts": [
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "setBot",
+      "discriminator": [
+        136,
+        185,
+        99,
+        236,
+        200,
+        131,
+        204,
+        118
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "setTreasury",
+      "discriminator": [
+        57,
+        97,
+        196,
+        95,
+        195,
+        206,
+        106,
+        136
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "settle",
+      "discriminator": [
+        175,
+        42,
+        185,
+        87,
+        144,
+        131,
+        102,
+        212
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "treasury",
+          "writable": true
+        },
+        {
+          "name": "lockAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "arg",
+                "path": "nonce"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "nonce",
+          "type": "u64"
+        },
+        {
+          "name": "amountToTransfer",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "withdraw",
+      "discriminator": [
+        183,
+        18,
+        70,
+        156,
+        148,
+        109,
+        161,
+        34
+      ],
+      "accounts": [
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    }
+  ],
+  "accounts": [
+    {
+      "name": "globalAccount",
+      "discriminator": [
+        129,
+        105,
+        124,
+        171,
+        189,
+        42,
+        108,
+        69
+      ]
+    },
+    {
+      "name": "lockAccount",
+      "discriminator": [
+        223,
+        64,
+        71,
+        124,
+        255,
+        86,
+        118,
+        192
+      ]
+    },
+    {
+      "name": "userAccount",
+      "discriminator": [
+        211,
+        33,
+        136,
+        16,
+        186,
+        110,
+        242,
+        127
+      ]
+    }
+  ],
+  "errors": [
+    {
+      "code": 6000,
+      "name": "unauthorized",
+      "msg": "Unauthorized access."
+    },
+    {
+      "code": 6001,
+      "name": "insufficientFunds",
+      "msg": "Insufficient funds."
+    },
+    {
+      "code": 6002,
+      "name": "signatureFormatInvalid",
+      "msg": "The signature format or recovery ID is incorrect."
+    },
+    {
+      "code": 6003,
+      "name": "signatureRecoveryFailed",
+      "msg": "Failed to recover public key from signature."
+    },
+    {
+      "code": 6004,
+      "name": "signatureMismatch",
+      "msg": "The recovered public key does not match the user's public key."
+    },
+    {
+      "code": 6005,
+      "name": "signatureExpired",
+      "msg": "The signature is expired."
+    }
+  ],
+  "types": [
+    {
+      "name": "ed25519RecoverInfo",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "signature",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "payload",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "deadline",
+            "type": "i64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "globalAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "authority",
+            "type": "pubkey"
+          },
+          {
+            "name": "bot",
+            "type": "pubkey"
+          },
+          {
+            "name": "treasury",
+            "type": "pubkey"
+          }
+        ]
+      }
+    },
+    {
+      "name": "lockAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "amount",
+            "type": "u64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "userAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "nonce",
+            "type": "u64"
+          },
+          {
+            "name": "lockedAmount",
+            "type": "u64"
+          },
+          {
+            "name": "vault",
+            "type": "pubkey"
+          }
+        ]
+      }
+    }
+  ]
+};
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/anchor/index.ts b/dephy-vending_machine-examples/balance-payment/app/src/anchor/index.ts
new file mode 100644
index 0000000..3a53c24
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/anchor/index.ts
@@ -0,0 +1,29 @@
+// Here we export some useful types and functions for interacting with the Anchor program.
+import { AnchorProvider, Program } from '@coral-xyz/anchor'
+import { Cluster, PublicKey } from '@solana/web3.js'
+import BalancePaymentIDL from './balance_payment.json'
+import type { BalancePayment } from './balance_payment'
+
+// Re-export the generated IDL and type
+export { BalancePayment, BalancePaymentIDL }
+
+// The programId is imported from the program IDL.
+export const BALANCE_PAYMENT_PROGRAM_ID = new PublicKey(BalancePaymentIDL.address)
+
+// This is a helper function to get the BalancePayment Anchor program.
+export function getBalancePaymentProgram(provider: AnchorProvider, address?: PublicKey) {
+  return new Program({ ...BalancePaymentIDL, address: address ? address.toBase58() : BalancePaymentIDL.address } as BalancePayment, provider)
+}
+
+// This is a helper function to get the program ID for the BalancePayment program depending on the cluster.
+export function getBalancePaymentProgramId(cluster: Cluster) {
+  switch (cluster) {
+    case 'devnet':
+    case 'testnet':
+      // This is the program ID for the BalancePayment program on devnet and testnet.
+      return new PublicKey('GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9')
+    case 'mainnet-beta':
+    default:
+      return BALANCE_PAYMENT_PROGRAM_ID
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/app/app-routes.tsx b/dephy-vending_machine-examples/balance-payment/app/src/app/app-routes.tsx
new file mode 100644
index 0000000..2ccb66f
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/app/app-routes.tsx
@@ -0,0 +1,32 @@
+import { UiLayout } from '@/components/ui/ui-layout'
+import { lazy } from 'react'
+import { Navigate, RouteObject, useRoutes } from 'react-router-dom'
+
+const AccountListFeature = lazy(() => import('../components/account/account-list-feature'))
+const AccountDetailFeature = lazy(() => import('../components/account/account-detail-feature'))
+const ClusterFeature = lazy(() => import('../components/cluster/cluster-feature'))
+const BalancePaymentFeature = lazy(() => import('../components/balance-payment/balance-payment-feature'))
+const DashboardFeature = lazy(() => import('../components/dashboard/dashboard-feature'))
+
+const links: { label: string; path: string }[] = [
+  { label: 'Account', path: '/account' },
+  { label: 'Clusters', path: '/clusters' },
+  { label: 'Balance Payment Program', path: '/program' },
+]
+
+const routes: RouteObject[] = [
+  { path: '/account/', element: <AccountListFeature /> },
+  { path: '/account/:address', element: <AccountDetailFeature /> },
+  { path: '/program', element: <BalancePaymentFeature /> },
+  { path: '/clusters', element: <ClusterFeature /> },
+]
+
+export function AppRoutes() {
+  const router = useRoutes([
+    { index: true, element: <Navigate to={'/dashboard'} replace={true} /> },
+    { path: '/dashboard', element: <DashboardFeature /> },
+    ...routes,
+    { path: '*', element: <Navigate to={'/dashboard'} replace={true} /> },
+  ])
+  return <UiLayout links={links}>{router}</UiLayout>
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/app/app.tsx b/dephy-vending_machine-examples/balance-payment/app/src/app/app.tsx
new file mode 100644
index 0000000..c161833
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/app/app.tsx
@@ -0,0 +1,18 @@
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
+import { ClusterProvider } from '../components/cluster/cluster-data-access'
+import { SolanaProvider } from '../components/solana/solana-provider'
+import { AppRoutes } from './app-routes'
+
+const client = new QueryClient()
+
+export function App() {
+  return (
+    <QueryClientProvider client={client}>
+      <ClusterProvider>
+        <SolanaProvider>
+          <AppRoutes />
+        </SolanaProvider>
+      </ClusterProvider>
+    </QueryClientProvider>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/app/favicon.ico b/dephy-vending_machine-examples/balance-payment/app/src/app/favicon.ico
new file mode 100644
index 0000000..3bc594b
Binary files /dev/null and b/dephy-vending_machine-examples/balance-payment/app/src/app/favicon.ico differ
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/assets/react.svg b/dephy-vending_machine-examples/balance-payment/app/src/assets/react.svg
new file mode 100644
index 0000000..8e0e0f1
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/assets/react.svg
@@ -0,0 +1 @@
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diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-data-access.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-data-access.tsx
new file mode 100644
index 0000000..d1a7678
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-data-access.tsx
@@ -0,0 +1,174 @@
+import { TOKEN_2022_PROGRAM_ID, TOKEN_PROGRAM_ID } from '@solana/spl-token'
+import { useConnection, useWallet } from '@solana/wallet-adapter-react'
+import {
+  Connection,
+  LAMPORTS_PER_SOL,
+  PublicKey,
+  SystemProgram,
+  TransactionMessage,
+  TransactionSignature,
+  VersionedTransaction,
+} from '@solana/web3.js'
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
+import toast from 'react-hot-toast'
+import { useTransactionToast } from '../ui/ui-layout'
+
+export function useGetBalance({ address }: { address: PublicKey }) {
+  const { connection } = useConnection()
+
+  return useQuery({
+    queryKey: ['get-balance', { endpoint: connection.rpcEndpoint, address }],
+    queryFn: () => connection.getBalance(address),
+  })
+}
+
+export function useGetSignatures({ address }: { address: PublicKey }) {
+  const { connection } = useConnection()
+
+  return useQuery({
+    queryKey: ['get-signatures', { endpoint: connection.rpcEndpoint, address }],
+    queryFn: () => connection.getSignaturesForAddress(address),
+  })
+}
+
+export function useGetTokenAccounts({ address }: { address: PublicKey }) {
+  const { connection } = useConnection()
+
+  return useQuery({
+    queryKey: ['get-token-accounts', { endpoint: connection.rpcEndpoint, address }],
+    queryFn: async () => {
+      const [tokenAccounts, token2022Accounts] = await Promise.all([
+        connection.getParsedTokenAccountsByOwner(address, {
+          programId: TOKEN_PROGRAM_ID,
+        }),
+        connection.getParsedTokenAccountsByOwner(address, {
+          programId: TOKEN_2022_PROGRAM_ID,
+        }),
+      ])
+      return [...tokenAccounts.value, ...token2022Accounts.value]
+    },
+  })
+}
+
+export function useTransferSol({ address }: { address: PublicKey }) {
+  const { connection } = useConnection()
+  const transactionToast = useTransactionToast()
+  const wallet = useWallet()
+  const client = useQueryClient()
+
+  return useMutation({
+    mutationKey: ['transfer-sol', { endpoint: connection.rpcEndpoint, address }],
+    mutationFn: async (input: { destination: PublicKey; amount: number }) => {
+      let signature: TransactionSignature = ''
+      try {
+        const { transaction, latestBlockhash } = await createTransaction({
+          publicKey: address,
+          destination: input.destination,
+          amount: input.amount,
+          connection,
+        })
+
+        // Send transaction and await for signature
+        signature = await wallet.sendTransaction(transaction, connection)
+
+        // Send transaction and await for signature
+        await connection.confirmTransaction({ signature, ...latestBlockhash }, 'confirmed')
+
+        console.log(signature)
+        return signature
+      } catch (error: unknown) {
+        console.log('error', `Transaction failed! ${error}`, signature)
+
+        return
+      }
+    },
+    onSuccess: (signature) => {
+      if (signature) {
+        transactionToast(signature)
+      }
+      return Promise.all([
+        client.invalidateQueries({
+          queryKey: ['get-balance', { endpoint: connection.rpcEndpoint, address }],
+        }),
+        client.invalidateQueries({
+          queryKey: ['get-signatures', { endpoint: connection.rpcEndpoint, address }],
+        }),
+      ])
+    },
+    onError: (error) => {
+      toast.error(`Transaction failed! ${error}`)
+    },
+  })
+}
+
+export function useRequestAirdrop({ address }: { address: PublicKey }) {
+  const { connection } = useConnection()
+  const transactionToast = useTransactionToast()
+  const client = useQueryClient()
+
+  return useMutation({
+    mutationKey: ['airdrop', { endpoint: connection.rpcEndpoint, address }],
+    mutationFn: async (amount: number = 1) => {
+      const [latestBlockhash, signature] = await Promise.all([
+        connection.getLatestBlockhash(),
+        connection.requestAirdrop(address, amount * LAMPORTS_PER_SOL),
+      ])
+
+      await connection.confirmTransaction({ signature, ...latestBlockhash }, 'confirmed')
+      return signature
+    },
+    onSuccess: (signature) => {
+      transactionToast(signature)
+      return Promise.all([
+        client.invalidateQueries({
+          queryKey: ['get-balance', { endpoint: connection.rpcEndpoint, address }],
+        }),
+        client.invalidateQueries({
+          queryKey: ['get-signatures', { endpoint: connection.rpcEndpoint, address }],
+        }),
+      ])
+    },
+  })
+}
+
+async function createTransaction({
+  publicKey,
+  destination,
+  amount,
+  connection,
+}: {
+  publicKey: PublicKey
+  destination: PublicKey
+  amount: number
+  connection: Connection
+}): Promise<{
+  transaction: VersionedTransaction
+  latestBlockhash: { blockhash: string; lastValidBlockHeight: number }
+}> {
+  // Get the latest blockhash to use in our transaction
+  const latestBlockhash = await connection.getLatestBlockhash()
+
+  // Create instructions to send, in this case a simple transfer
+  const instructions = [
+    SystemProgram.transfer({
+      fromPubkey: publicKey,
+      toPubkey: destination,
+      lamports: amount * LAMPORTS_PER_SOL,
+    }),
+  ]
+
+  // Create a new TransactionMessage with version and compile it to legacy
+  const messageLegacy = new TransactionMessage({
+    payerKey: publicKey,
+    recentBlockhash: latestBlockhash.blockhash,
+    instructions,
+  }).compileToLegacyMessage()
+
+  // Create a new VersionedTransaction which supports legacy and v0
+  const transaction = new VersionedTransaction(messageLegacy)
+
+  return {
+    transaction,
+    latestBlockhash,
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-detail-feature.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-detail-feature.tsx
new file mode 100644
index 0000000..0d4869e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-detail-feature.tsx
@@ -0,0 +1,44 @@
+import { PublicKey } from '@solana/web3.js'
+import { useMemo } from 'react'
+import { useParams } from 'react-router'
+import { ExplorerLink } from '../cluster/cluster-ui'
+import { AppHero, ellipsify } from '../ui/ui-layout'
+import { AccountBalance, AccountButtons, AccountTokens, AccountTransactions } from './account-ui'
+
+export default function AccountDetailFeature() {
+  const params = useParams() as { address?: string }
+  const address = useMemo(() => {
+    if (!params.address) {
+      return
+    }
+    try {
+      return new PublicKey(params.address)
+    } catch (e) {
+      console.log(`Invalid public key`, e)
+    }
+  }, [params])
+  if (!address) {
+    return <div>Error loading account</div>
+  }
+
+  return (
+    <div>
+      <AppHero
+        title={<AccountBalance address={address} />}
+        subtitle={
+          <div className="my-4">
+            <ExplorerLink path={`account/${address}`} label={ellipsify(address.toString())} />
+          </div>
+        }
+      >
+        <div className="my-4">
+          <AccountButtons address={address} />
+        </div>
+      </AppHero>
+      <div className="space-y-8">
+        <AccountTokens address={address} />
+        <AccountTransactions address={address} />
+      </div>
+    </div>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-list-feature.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-list-feature.tsx
new file mode 100644
index 0000000..04d351a
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-list-feature.tsx
@@ -0,0 +1,19 @@
+import { useWallet } from '@solana/wallet-adapter-react'
+import { Navigate } from 'react-router'
+import { WalletButton } from '../solana/solana-provider'
+
+export default function AccountListFeature() {
+  const { publicKey } = useWallet()
+
+  if (publicKey) {
+    return <Navigate to={`/account/${publicKey.toString()}`} replace />
+  }
+
+  return (
+    <div className="hero py-[64px]">
+      <div className="hero-content text-center">
+        <WalletButton />
+      </div>
+    </div>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-ui.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-ui.tsx
new file mode 100644
index 0000000..0c1bf09
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/account/account-ui.tsx
@@ -0,0 +1,347 @@
+import { useWallet } from '@solana/wallet-adapter-react'
+import { LAMPORTS_PER_SOL, PublicKey } from '@solana/web3.js'
+import { IconRefresh } from '@tabler/icons-react'
+import { useQueryClient } from '@tanstack/react-query'
+import { useMemo, useState } from 'react'
+import { useCluster } from '../cluster/cluster-data-access'
+import { ExplorerLink } from '../cluster/cluster-ui'
+import { AppModal, ellipsify } from '../ui/ui-layout'
+import {
+  useGetBalance,
+  useGetSignatures,
+  useGetTokenAccounts,
+  useRequestAirdrop,
+  useTransferSol,
+} from './account-data-access'
+
+export function AccountBalance({ address }: { address: PublicKey }) {
+  const query = useGetBalance({ address })
+
+  return (
+    <div>
+      <h1 className="text-5xl font-bold cursor-pointer" onClick={() => query.refetch()}>
+        {query.data ? <BalanceSol balance={query.data} /> : '...'} SOL
+      </h1>
+    </div>
+  )
+}
+export function AccountChecker() {
+  const { publicKey } = useWallet()
+  if (!publicKey) {
+    return null
+  }
+  return <AccountBalanceCheck address={publicKey} />
+}
+export function AccountBalanceCheck({ address }: { address: PublicKey }) {
+  const { cluster } = useCluster()
+  const mutation = useRequestAirdrop({ address })
+  const query = useGetBalance({ address })
+
+  if (query.isLoading) {
+    return null
+  }
+  if (query.isError || !query.data) {
+    return (
+      <div className="alert alert-warning text-warning-content/80 rounded-none flex justify-center">
+        <span>
+          You are connected to <strong>{cluster.name}</strong> but your account is not found on this cluster.
+        </span>
+        <button
+          className="btn btn-xs btn-neutral"
+          onClick={() => mutation.mutateAsync(1).catch((err) => console.log(err))}
+        >
+          Request Airdrop
+        </button>
+      </div>
+    )
+  }
+  return null
+}
+
+export function AccountButtons({ address }: { address: PublicKey }) {
+  const wallet = useWallet()
+  const { cluster } = useCluster()
+  const [showAirdropModal, setShowAirdropModal] = useState(false)
+  const [showReceiveModal, setShowReceiveModal] = useState(false)
+  const [showSendModal, setShowSendModal] = useState(false)
+
+  return (
+    <div>
+      <ModalAirdrop hide={() => setShowAirdropModal(false)} address={address} show={showAirdropModal} />
+      <ModalReceive address={address} show={showReceiveModal} hide={() => setShowReceiveModal(false)} />
+      <ModalSend address={address} show={showSendModal} hide={() => setShowSendModal(false)} />
+      <div className="space-x-2">
+        <button
+          disabled={cluster.network?.includes('mainnet')}
+          className="btn btn-xs lg:btn-md btn-outline"
+          onClick={() => setShowAirdropModal(true)}
+        >
+          Airdrop
+        </button>
+        <button
+          disabled={wallet.publicKey?.toString() !== address.toString()}
+          className="btn btn-xs lg:btn-md btn-outline"
+          onClick={() => setShowSendModal(true)}
+        >
+          Send
+        </button>
+        <button className="btn btn-xs lg:btn-md btn-outline" onClick={() => setShowReceiveModal(true)}>
+          Receive
+        </button>
+      </div>
+    </div>
+  )
+}
+
+export function AccountTokens({ address }: { address: PublicKey }) {
+  const [showAll, setShowAll] = useState(false)
+  const query = useGetTokenAccounts({ address })
+  const client = useQueryClient()
+  const items = useMemo(() => {
+    if (showAll) return query.data
+    return query.data?.slice(0, 5)
+  }, [query.data, showAll])
+
+  return (
+    <div className="space-y-2">
+      <div className="justify-between">
+        <div className="flex justify-between">
+          <h2 className="text-2xl font-bold">Token Accounts</h2>
+          <div className="space-x-2">
+            {query.isLoading ? (
+              <span className="loading loading-spinner"></span>
+            ) : (
+              <button
+                className="btn btn-sm btn-outline"
+                onClick={async () => {
+                  await query.refetch()
+                  await client.invalidateQueries({
+                    queryKey: ['getTokenAccountBalance'],
+                  })
+                }}
+              >
+                <IconRefresh size={16} />
+              </button>
+            )}
+          </div>
+        </div>
+      </div>
+      {query.isError && <pre className="alert alert-error">Error: {query.error?.message.toString()}</pre>}
+      {query.isSuccess && (
+        <div>
+          {query.data.length === 0 ? (
+            <div>No token accounts found.</div>
+          ) : (
+            <table className="table border-4 rounded-lg border-separate border-base-300">
+              <thead>
+                <tr>
+                  <th>Public Key</th>
+                  <th>Mint</th>
+                  <th className="text-right">Balance</th>
+                </tr>
+              </thead>
+              <tbody>
+                {items?.map(({ account, pubkey }) => (
+                  <tr key={pubkey.toString()}>
+                    <td>
+                      <div className="flex space-x-2">
+                        <span className="font-mono">
+                          <ExplorerLink label={ellipsify(pubkey.toString())} path={`account/${pubkey.toString()}`} />
+                        </span>
+                      </div>
+                    </td>
+                    <td>
+                      <div className="flex space-x-2">
+                        <span className="font-mono">
+                          <ExplorerLink
+                            label={ellipsify(account.data.parsed.info.mint)}
+                            path={`account/${account.data.parsed.info.mint.toString()}`}
+                          />
+                        </span>
+                      </div>
+                    </td>
+                    <td className="text-right">
+                      <span className="font-mono">{account.data.parsed.info.tokenAmount.uiAmount}</span>
+                    </td>
+                  </tr>
+                ))}
+
+                {(query.data?.length ?? 0) > 5 && (
+                  <tr>
+                    <td colSpan={4} className="text-center">
+                      <button className="btn btn-xs btn-outline" onClick={() => setShowAll(!showAll)}>
+                        {showAll ? 'Show Less' : 'Show All'}
+                      </button>
+                    </td>
+                  </tr>
+                )}
+              </tbody>
+            </table>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
+
+export function AccountTransactions({ address }: { address: PublicKey }) {
+  const query = useGetSignatures({ address })
+  const [showAll, setShowAll] = useState(false)
+
+  const items = useMemo(() => {
+    if (showAll) return query.data
+    return query.data?.slice(0, 5)
+  }, [query.data, showAll])
+
+  return (
+    <div className="space-y-2">
+      <div className="flex justify-between">
+        <h2 className="text-2xl font-bold">Transaction History</h2>
+        <div className="space-x-2">
+          {query.isLoading ? (
+            <span className="loading loading-spinner"></span>
+          ) : (
+            <button className="btn btn-sm btn-outline" onClick={() => query.refetch()}>
+              <IconRefresh size={16} />
+            </button>
+          )}
+        </div>
+      </div>
+      {query.isError && <pre className="alert alert-error">Error: {query.error?.message.toString()}</pre>}
+      {query.isSuccess && (
+        <div>
+          {query.data.length === 0 ? (
+            <div>No transactions found.</div>
+          ) : (
+            <table className="table border-4 rounded-lg border-separate border-base-300">
+              <thead>
+                <tr>
+                  <th>Signature</th>
+                  <th className="text-right">Slot</th>
+                  <th>Block Time</th>
+                  <th className="text-right">Status</th>
+                </tr>
+              </thead>
+              <tbody>
+                {items?.map((item) => (
+                  <tr key={item.signature}>
+                    <th className="font-mono">
+                      <ExplorerLink path={`tx/${item.signature}`} label={ellipsify(item.signature, 8)} />
+                    </th>
+                    <td className="font-mono text-right">
+                      <ExplorerLink path={`block/${item.slot}`} label={item.slot.toString()} />
+                    </td>
+                    <td>{new Date((item.blockTime ?? 0) * 1000).toISOString()}</td>
+                    <td className="text-right">
+                      {item.err ? (
+                        <div className="badge badge-error" title={JSON.stringify(item.err)}>
+                          Failed
+                        </div>
+                      ) : (
+                        <div className="badge badge-success">Success</div>
+                      )}
+                    </td>
+                  </tr>
+                ))}
+                {(query.data?.length ?? 0) > 5 && (
+                  <tr>
+                    <td colSpan={4} className="text-center">
+                      <button className="btn btn-xs btn-outline" onClick={() => setShowAll(!showAll)}>
+                        {showAll ? 'Show Less' : 'Show All'}
+                      </button>
+                    </td>
+                  </tr>
+                )}
+              </tbody>
+            </table>
+          )}
+        </div>
+      )}
+    </div>
+  )
+}
+
+function BalanceSol({ balance }: { balance: number }) {
+  return <span>{Math.round((balance / LAMPORTS_PER_SOL) * 100000) / 100000}</span>
+}
+
+function ModalReceive({ hide, show, address }: { hide: () => void; show: boolean; address: PublicKey }) {
+  return (
+    <AppModal title="Receive" hide={hide} show={show}>
+      <p>Receive assets by sending them to your public key:</p>
+      <code>{address.toString()}</code>
+    </AppModal>
+  )
+}
+
+function ModalAirdrop({ hide, show, address }: { hide: () => void; show: boolean; address: PublicKey }) {
+  const mutation = useRequestAirdrop({ address })
+  const [amount, setAmount] = useState('2')
+
+  return (
+    <AppModal
+      hide={hide}
+      show={show}
+      title="Airdrop"
+      submitDisabled={!amount || mutation.isPending}
+      submitLabel="Request Airdrop"
+      submit={() => mutation.mutateAsync(parseFloat(amount)).then(() => hide())}
+    >
+      <input
+        disabled={mutation.isPending}
+        type="number"
+        step="any"
+        min="1"
+        className="input input-bordered w-full"
+        value={amount}
+        onChange={(e) => setAmount(e.target.value)}
+      />
+    </AppModal>
+  )
+}
+
+function ModalSend({ hide, show, address }: { hide: () => void; show: boolean; address: PublicKey }) {
+  const wallet = useWallet()
+  const mutation = useTransferSol({ address })
+  const [destination, setDestination] = useState('')
+  const [amount, setAmount] = useState('1')
+
+  if (!address || !wallet.sendTransaction) {
+    return <div>Wallet not connected</div>
+  }
+
+  return (
+    <AppModal
+      hide={hide}
+      show={show}
+      title="Send"
+      submitDisabled={!destination || !amount || mutation.isPending}
+      submitLabel="Send"
+      submit={() => {
+        mutation
+          .mutateAsync({
+            destination: new PublicKey(destination),
+            amount: parseFloat(amount),
+          })
+          .then(() => hide())
+      }}
+    >
+      <input
+        disabled={mutation.isPending}
+        type="text"
+        className="input input-bordered w-full"
+        value={destination}
+        onChange={(e) => setDestination(e.target.value)}
+      />
+      <input
+        disabled={mutation.isPending}
+        type="number"
+        step="any"
+        min="1"
+        className="input input-bordered w-full"
+        value={amount}
+        onChange={(e) => setAmount(e.target.value)}
+      />
+    </AppModal>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/balance-payment/balance-payment-data-access.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/balance-payment/balance-payment-data-access.tsx
new file mode 100644
index 0000000..8013e85
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/balance-payment/balance-payment-data-access.tsx
@@ -0,0 +1,72 @@
+import { getBalancePaymentProgram, getBalancePaymentProgramId } from '../../anchor'
+import { Cluster } from '@solana/web3.js'
+import { v4 as uuidv4 } from "uuid";
+import { useMemo } from 'react'
+import { useCluster } from '../cluster/cluster-data-access'
+import { useAnchorProvider } from '../solana/solana-provider'
+import { BN, web3 } from '@coral-xyz/anchor'
+
+export function useBalancePaymentProgram() {
+  const { cluster } = useCluster()
+  const provider = useAnchorProvider()
+  const programId = useMemo(() => getBalancePaymentProgramId(cluster.network as Cluster), [cluster])
+  const program = useMemo(() => getBalancePaymentProgram(provider, programId), [provider, programId])
+
+  const getGlobalPubkey = () => {
+    const [globalAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("GLOBAL")],
+      programId
+    );
+    return globalAccountPubkey;
+  }
+
+  const getUserAccountPubkey = (user: web3.PublicKey) => {
+    const [userAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("USER"), user.toBuffer()],
+      programId
+    );
+    return userAccountPubkey;
+  };
+
+  const getUserVaultPubkey = (user: web3.PublicKey) => {
+    const [vaultPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("VAULT"), user.toBuffer()],
+      programId
+    );
+    return vaultPubkey;
+  };
+
+  const getLockAccountPubkey = (user: web3.PublicKey, nonce: BN) => {
+    const [lockAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [
+        Buffer.from("LOCK"),
+        user.toBuffer(),
+        nonce.toArrayLike(Buffer, "le", 8),
+      ],
+      program.programId
+    );
+    return lockAccountPubkey;
+  };
+
+  const generate64ByteUUIDPayload = () => {
+    const uuid = uuidv4().replace(/-/g, ""); // 去掉连字符
+    const uuidBuffer = Buffer.from(uuid, "hex");
+
+    const extendedBuffer = Buffer.concat([uuidBuffer, Buffer.alloc(48, 0)]);
+
+    return {
+      uuid,
+      uuidBytes: extendedBuffer
+    };
+  };
+
+  return {
+    program,
+    programId,
+    getGlobalPubkey,
+    getUserAccountPubkey,
+    getUserVaultPubkey,
+    getLockAccountPubkey,
+    generate64ByteUUIDPayload
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/balance-payment/balance-payment-feature.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/balance-payment/balance-payment-feature.tsx
new file mode 100644
index 0000000..c68f338
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/balance-payment/balance-payment-feature.tsx
@@ -0,0 +1,721 @@
+import { useWallet } from '@solana/wallet-adapter-react'
+import { WalletButton } from '../solana/solana-provider'
+import { useBalancePaymentProgram } from './balance-payment-data-access'
+import { useEffect, useState, useRef } from 'react'
+import { BN } from '@coral-xyz/anchor'
+import keccak from 'keccak'
+import { useTransactionToast } from '../ui/ui-layout'
+import toast from 'react-hot-toast'
+import { finalizeEvent, generateSecretKey } from 'nostr-tools/pure'
+import { Relay } from 'nostr-tools/relay'
+import bs58 from 'bs58'
+
+const SIGN_MESSAGE_PREFIX = 'DePHY vending machine/Example:\n'
+const RELAY_ENDPOINT = import.meta.env.VITE_RELAY_ENDPOINT || 'ws://127.0.0.1:8000'
+
+// define charge status
+type ChargeStatus = 'idle' | 'requested' | 'working' | 'available' | 'error'
+
+export default function BalancePaymentFeature() {
+  const transactionToast = useTransactionToast()
+  const { publicKey, wallet, signMessage } = useWallet()
+  const { program, getGlobalPubkey, getUserAccountPubkey, generate64ByteUUIDPayload } = useBalancePaymentProgram()
+
+  const [selectedTab, setSelectedTab] = useState<'decharge' | 'gacha'>('decharge')
+  const [recoverInfo, setRecoverInfo] = useState<any>()
+  const [serialNumberStr, setSerialNumberStr] = useState<string | null>(null)
+  const [serialNumberBytes, setSerialNumberBytes] = useState<Uint8Array | null>(null)
+  const [globalAccount, setGlobalAccount] = useState<any>(null)
+  const [userAccount, setUserAccount] = useState<any>(null)
+  const [vaultBalance, setVaultBalance] = useState<number | null>(null)
+  const [depositAmount, setDepositAmount] = useState<string>('')
+  const [withdrawAmount, setWithdrawAmount] = useState<string>('')
+  const [machinePubkey, setMachinePubkey] = useState<string>(
+    'd041ea9854f2117b82452457c4e6d6593a96524027cd4032d2f40046deb78d93',
+  )
+  const [relay, setRelay] = useState<Relay>()
+  const [sk, setSk] = useState<Uint8Array | null>(null)
+  const [chargeStatus, setChargeStatus] = useState<ChargeStatus>('idle')
+  const [events, setEvents] = useState<any[]>([])
+  const [expandedEventIndex, setExpandedEventIndex] = useState<number | null>(null)
+  const [isChargeDisabled, setIsChargeDisabled] = useState(false)
+  const isTabDisabled = chargeStatus !== 'idle' && chargeStatus !== 'available'
+  const [initialRequestId, setInitialRequestId] = useState<string | null>(null)
+  const [initialPayload, setInitialPayload] = useState<string | null>(null)
+  const [stopFlag, setStopFlag] = useState(false)
+  const [isStopPending, setIsStopPending] = useState(false)
+
+  const subscriptionRef = useRef<any>(null)
+
+  useEffect(() => {
+    const { uuid, uuidBytes } = generate64ByteUUIDPayload()
+    setSerialNumberStr(uuid)
+    setSerialNumberBytes(uuidBytes)
+  }, [selectedTab])
+
+  useEffect(() => {
+    if (!globalAccount) {
+      fetchGlobalAccount()
+    }
+  }, [program])
+
+  useEffect(() => {
+    if (!userAccount) {
+      fetchUserAccount()
+    }
+  }, [program, publicKey])
+
+  useEffect(() => {
+    if (publicKey) {
+      const intervalId = setInterval(fetchUserAccount, 3000)
+
+      return () => clearInterval(intervalId)
+    }
+  }, [publicKey])
+
+  useEffect(() => {
+    ;(async () => {
+      const sk = generateSecretKey()
+      setSk(sk)
+
+      try {
+        const relay = await Relay.connect(RELAY_ENDPOINT)
+        setRelay(relay)
+        toast.success(`connected to ${relay.url}`)
+      } catch (error) {
+        toast.error(`fail to connect relay, ${error}`)
+      }
+    })()
+  }, [])
+
+  const solToLamports = (sol: string): BN => {
+    const solNumber = parseFloat(sol)
+    if (isNaN(solNumber) || solNumber < 0) {
+      throw new Error('Invalid SOL amount')
+    }
+    return new BN(solNumber * 10 ** 9)
+  }
+
+  const handleRegister = async () => {
+    if (!publicKey || !program) {
+      console.error('Wallet not connected or program not loaded')
+      return
+    }
+
+    try {
+      const transactionSignature = await program.methods
+        .register()
+        .accountsPartial({
+          user: publicKey,
+        })
+        .rpc()
+
+      console.log('Register transaction signature:', transactionSignature)
+      transactionToast(transactionSignature)
+
+      const userAccountPubkey = getUserAccountPubkey(publicKey)
+      const user = await program.account.userAccount.fetch(userAccountPubkey)
+      setUserAccount(user)
+      const userVaultBalance = await program.provider.connection.getBalance(user.vault)
+      setVaultBalance(userVaultBalance)
+    } catch (error) {
+      toast.error(`Error registering user account: ${error}`)
+    }
+  }
+
+  const handleDeposit = async () => {
+    if (!publicKey || !program || !depositAmount) {
+      console.error('Wallet not connected or program not loaded or amount not set')
+      return
+    }
+
+    try {
+      const amount = solToLamports(depositAmount)
+      const transactionSignature = await program.methods
+        .deposit(amount)
+        .accountsPartial({
+          user: publicKey,
+        })
+        .rpc()
+
+      console.log('Deposit transaction signature:', transactionSignature)
+      transactionToast(transactionSignature)
+
+      const userAccountPubkey = getUserAccountPubkey(publicKey)
+      const user = await program.account.userAccount.fetch(userAccountPubkey)
+      const userVaultBalance = await program.provider.connection.getBalance(user.vault)
+      setVaultBalance(userVaultBalance)
+    } catch (error) {
+      toast.error(`Error depositing: ${error}`)
+    }
+  }
+
+  const handleWithdraw = async () => {
+    if (!publicKey || !program || !withdrawAmount) {
+      console.error('Wallet not connected or program not loaded or amount not set')
+      return
+    }
+
+    try {
+      const amount = solToLamports(withdrawAmount)
+      const transactionSignature = await program.methods
+        .withdraw(amount)
+        .accountsPartial({
+          user: publicKey,
+        })
+        .rpc()
+
+      console.log('Withdraw transaction signature:', transactionSignature)
+      transactionToast(transactionSignature)
+
+      const userAccountPubkey = getUserAccountPubkey(publicKey)
+      const user = await program.account.userAccount.fetch(userAccountPubkey)
+      const userVaultBalance = await program.provider.connection.getBalance(user.vault)
+      setVaultBalance(userVaultBalance)
+    } catch (error) {
+      toast.error(`Error withdrawing: ${error}`)
+    }
+  }
+
+  const handleSelectTab = (tab: 'decharge' | 'gacha') => {
+    if (isTabDisabled) {
+      return
+    }
+    setSelectedTab(tab)
+    handleReset()
+  }
+
+  const fetchGlobalAccount = async () => {
+    if (!program) return
+
+    const globalAccountPubkey = getGlobalPubkey()
+    const global = await program.account.globalAccount.fetch(globalAccountPubkey)
+    setGlobalAccount(global)
+  }
+
+  const fetchUserAccount = async () => {
+    if (!publicKey || !program) return
+
+    const userAccountPubkey = getUserAccountPubkey(publicKey)
+    console.log('userAccountPubkey:', userAccountPubkey.toString())
+    const user = await program.account.userAccount.fetch(userAccountPubkey)
+    const userVaultBalance = await program.provider.connection.getBalance(user.vault)
+    setVaultBalance(userVaultBalance)
+    setUserAccount(user)
+  }
+
+  const handleCharge = async () => {
+    if (!wallet || !publicKey || !signMessage || !serialNumberBytes) {
+      console.error('Wallet not connected or serial number not generated')
+      return
+    }
+
+    setIsChargeDisabled(true)
+
+    const userAccountPubkey = getUserAccountPubkey(publicKey)
+    const user = await program.account.userAccount.fetch(userAccountPubkey)
+
+    const nonce = user.nonce
+    const payload = serialNumberBytes
+    const deadline = new BN(Date.now() / 1000 + 60 * 30) // 30 minutes later
+
+    const message = Buffer.concat([payload, nonce.toArrayLike(Buffer, 'le', 8), deadline.toArrayLike(Buffer, 'le', 8)])
+    const messageHash = keccak('keccak256').update(message).digest()
+    const hashedMessageBase58 = bs58.encode(messageHash)
+    const digest = new TextEncoder().encode(`${SIGN_MESSAGE_PREFIX}${hashedMessageBase58}`)
+
+    let recoverInfo
+    try {
+      const signature = await signMessage(digest)
+      recoverInfo = {
+        signature: Array.from(signature),
+        payload: Array.from(payload),
+        deadline: deadline.toNumber(),
+      }
+      setRecoverInfo(recoverInfo)
+    } catch (error) {
+      toast.error(`Error signing message: ${error}`)
+      setIsChargeDisabled(false)
+      return
+    }
+
+    try {
+      await publishToRelay(nonce.toNumber(), recoverInfo, publicKey.toString())
+    } catch (error) {
+      toast.error(`Error publishing to relay: ${error}`)
+      setIsChargeDisabled(false)
+      return
+    }
+
+    try {
+      await listenFromRelay()
+    } catch (error) {
+      toast.error(`Error listening from relay: ${error}`)
+      setIsChargeDisabled(false)
+    }
+  }
+
+  const handleStop = async () => {
+    if (!sk || !relay || !machinePubkey || !initialRequestId || !initialPayload) {
+      toast.error('Not initialized')
+      return
+    }
+
+    setIsStopPending(true)
+    try {
+      const sTag = selectedTab === 'decharge' ? 'dephy-decharge-controller' : 'dephy-gacha-controller'
+      const contentData = {
+        Request: {
+          to_status: 'Available',
+          reason: 'UserRequest',
+          initial_request: initialRequestId,
+          payload: initialPayload,
+        },
+      }
+
+      const content = JSON.stringify(contentData)
+      const eventTemplate = {
+        kind: 1573,
+        created_at: Math.floor(Date.now() / 1000),
+        tags: [
+          ['s', sTag],
+          ['p', machinePubkey],
+        ],
+        content,
+      }
+      const signedEvent = finalizeEvent(eventTemplate, sk)
+      await relay.publish(signedEvent)
+      toast.success(`Stop request id [${initialRequestId}]`)
+      setStopFlag(true)
+    } catch (error) {
+      toast.error(`Failed to send stop request: ${error}`)
+      setIsStopPending(false)
+    }
+  }
+
+  const publishToRelay = async (nonce: number, recoverInfo: any, user: string) => {
+    if (!sk) {
+      toast.error('sk not initialized')
+      return
+    }
+    if (!machinePubkey) {
+      toast.error('machinePubkey not initialized')
+      return
+    }
+    if (!relay) {
+      toast.error('relay not initialized')
+      return
+    }
+    const sTag = selectedTab === 'decharge' ? 'dephy-decharge-controller' : 'dephy-gacha-controller'
+
+    const payload = JSON.stringify({
+      recover_info: JSON.stringify(recoverInfo),
+      nonce,
+      user,
+    })
+
+    setInitialPayload(payload)
+
+    const contentData = {
+      Request: {
+        to_status: 'Working',
+        reason: 'UserRequest',
+        initial_request: '0000000000000000000000000000000000000000000000000000000000000000',
+        payload,
+      },
+    }
+
+    const content = JSON.stringify(contentData)
+
+    let eventTemplate = {
+      kind: 1573,
+      created_at: Math.floor(Date.now() / 1000),
+      tags: [
+        ['s', sTag],
+        ['p', machinePubkey],
+      ],
+      content,
+    }
+    const signedEvent = finalizeEvent(eventTemplate, sk)
+    await relay.publish(signedEvent)
+  }
+
+  const listenFromRelay = async () => {
+    if (!sk) {
+      toast.error('sk not initialized')
+      return
+    }
+    if (!machinePubkey) {
+      toast.error('machinePubkey not initialized')
+      return
+    }
+    if (!relay) {
+      toast.error('relay not initialized')
+      return
+    }
+
+    const sTag = selectedTab === 'decharge' ? 'dephy-decharge-controller' : 'dephy-gacha-controller'
+
+    // clear old subscription
+    if (subscriptionRef.current) {
+      subscriptionRef.current.close()
+    }
+
+    // create new subscription
+    subscriptionRef.current = relay.subscribe(
+      [
+        {
+          kinds: [1573],
+          since: Math.floor(Date.now() / 1000),
+          '#s': [sTag],
+          '#p': [machinePubkey],
+        },
+      ],
+      {
+        onevent: async (event) => {
+          console.log('event received:', event)
+          try {
+            const content = JSON.parse(event.content)
+            if (content.Request) {
+              setChargeStatus('requested')
+              setInitialRequestId(event.id)
+            } else if (content.Status) {
+              if (content.Status.status === 'Working') {
+                setChargeStatus('working')
+              } else if (content.Status.status === 'Available') {
+                setChargeStatus('available')
+                setIsChargeDisabled(false)
+              }
+            }
+            setEvents((prevEvents) => [...prevEvents, event])
+          } catch (error) {
+            console.error('Error parsing event content:', error)
+            setChargeStatus('error')
+            setEvents((prevEvents) => [...prevEvents, { error: 'Failed to parse event content', rawEvent: event }])
+          }
+        },
+        oneose() {
+          console.log('eose received')
+        },
+        onclose(reason) {
+          console.log('close received:', reason)
+        },
+      },
+    )
+  }
+
+  // reset status
+  const handleReset = () => {
+    // clear old subscription
+    if (subscriptionRef.current) {
+      subscriptionRef.current.close()
+      subscriptionRef.current = null
+    }
+
+    setRecoverInfo(null)
+    setEvents([])
+    setChargeStatus('idle')
+    setIsChargeDisabled(false)
+    setInitialRequestId(null)
+    setInitialPayload(null)
+    setStopFlag(false)
+    setIsStopPending(false)
+  }
+
+  const ProgressBar = () => {
+    let progress = 0
+    // let statusText = ''
+    let barColor = 'bg-gray-300' // default gray
+
+    const statusTextMap = {
+      decharge: {
+        requested: 'Requested - Waiting for charging station...',
+        working: 'Working - Charging in progress...',
+        available: `Available - Charging ${stopFlag ? 'stopped' : 'completed'}!`,
+        error: 'Error - Charging failed!',
+        idle: 'Idle - Ready to charge',
+      },
+      gacha: {
+        requested: 'Requested - Waiting for gacha machine...',
+        working: 'Working - Gacha in progress...',
+        available: 'Available - Gacha completed!',
+        error: 'Error - Gacha failed!',
+        idle: 'Idle - Ready to play',
+      },
+    }
+
+    const statusText = statusTextMap[selectedTab][chargeStatus]
+
+    switch (chargeStatus) {
+      case 'requested':
+        progress = 33
+        // statusText = 'Requested - Waiting for charging station...'
+        barColor = 'bg-blue-500'
+        break
+      case 'working':
+        progress = 66
+        // statusText = 'Working - Charging in progress...'
+        barColor = 'bg-blue-500'
+        break
+      case 'available':
+        progress = 100
+        // statusText = 'Available - Charging completed!'
+        barColor = 'bg-green-500'
+        break
+      case 'error':
+        progress = 100
+        // statusText = 'Error - Something went wrong!'
+        barColor = 'bg-red-500'
+        break
+      default:
+        progress = 0
+        // statusText = 'Idle - Ready to charge'
+        barColor = 'bg-gray-300'
+    }
+
+    return (
+      <div className="w-full mb-8">
+        <div className="h-2 w-full bg-gray-200 rounded-full overflow-hidden">
+          <div className={`h-full ${barColor} transition-all duration-500`} style={{ width: `${progress}%` }}></div>
+        </div>
+        <p className="mt-2 text-sm text-gray-600">{statusText}</p>
+      </div>
+    )
+  }
+
+  const EventJsonViewer = ({ event, index }: { event: any; index: number }) => {
+    const isExpanded = expandedEventIndex === index
+
+    const toggleExpand = () => {
+      if (isExpanded) {
+        setExpandedEventIndex(null)
+      } else {
+        setExpandedEventIndex(index)
+      }
+    }
+
+    const getPurpose = () => {
+      const sTag = event.tags.find((t: string[]) => t[0] === 's')?.[1]
+      const eventType = sTag === 'dephy-decharge-controller' ? 'Decharge' : 'Gacha'
+
+      try {
+        const content = JSON.parse(event.content)
+        if (content.Request) return `${eventType} Request`
+        if (content.Status) return `${eventType} Status: ${content.Status.status}`
+      } catch {
+        return 'Invalid Event'
+      }
+      return 'Unknown Event'
+    }
+
+    const formatTime = (timestamp: number) => {
+      return new Date(timestamp * 1000).toLocaleString()
+    }
+
+    return (
+      <div className="mt-4 p-4 bg-base-100 rounded-lg shadow-md">
+        <div className="font-bold cursor-pointer flex justify-between items-center" onClick={toggleExpand}>
+          <span>
+            <span className="mr-2">{isExpanded ? '▲' : '▼'}</span>
+            Event {index + 1} - {getPurpose()}
+          </span>
+          <div className="flex items-center">
+            <span className="text-sm text-gray-500 mr-2">{formatTime(event.created_at)}</span>
+          </div>
+        </div>
+        {isExpanded && (
+          <pre className="mt-2 break-all whitespace-pre-wrap text-xs">{JSON.stringify(event, null, 2)}</pre>
+        )}
+      </div>
+    )
+  }
+
+  return publicKey ? (
+    <div className="max-w-4xl mx-auto p-4">
+      {/* Tab */}
+      <div className="inline-flex p-1 bg-gray-100 rounded-full mb-8">
+        <button
+          className={`px-6 py-2 rounded-full text-sm font-medium transition-all duration-300 ${
+            selectedTab === 'decharge' ? 'bg-white text-blue-600 shadow-sm' : 'text-gray-500 hover:text-gray-700'
+          } ${isTabDisabled ? 'opacity-50 cursor-not-allowed' : ''}`}
+          onClick={() => handleSelectTab('decharge')}
+          disabled={isTabDisabled}
+        >
+          Decharge
+          {selectedTab === 'decharge' && isTabDisabled && <span className="ml-2 animate-pulse">(Processing...)</span>}
+        </button>
+        <button
+          className={`px-6 py-2 rounded-full text-sm font-medium transition-all duration-300 ${
+            selectedTab === 'gacha' ? 'bg-white text-pink-600 shadow-sm' : 'text-gray-500 hover:text-gray-700'
+          } ${isTabDisabled ? 'opacity-50 cursor-not-allowed' : ''}`}
+          onClick={() => handleSelectTab('gacha')}
+          disabled={isTabDisabled}
+        >
+          Gacha
+          {selectedTab === 'gacha' && isTabDisabled && <span className="ml-2 animate-pulse">(Processing...)</span>}
+        </button>
+      </div>
+
+      <div className="flex flex-wrap gap-4 mb-8">
+        {/* userAccount */}
+        <div className="flex-1 p-4 bg-base-200 rounded-lg shadow-md">
+          <h2 className="text-xl font-bold mb-2">User Account</h2>
+          {userAccount ? (
+            <div className="space-y-2">
+              <p>
+                <span className="font-semibold">Nonce:</span> <span>{userAccount.nonce.toString()}</span>
+              </p>
+              <p>
+                <span className="font-semibold">Locked Amount:</span>{' '}
+                <span>{userAccount.lockedAmount.toNumber() / 10 ** 9} SOL</span>
+              </p>
+              <p>
+                <span className="font-semibold">Vault:</span> <span>{userAccount.vault.toString()}</span>
+              </p>
+              <p>
+                <span className="font-semibold">Vault Balance:</span>{' '}
+                <span>{vaultBalance ? `${vaultBalance / 10 ** 9} SOL` : 'Loading...'}</span>
+              </p>
+            </div>
+          ) : (
+            <div className="flex flex-col items-center">
+              <p>No user account data found.</p>
+              <button className="btn btn-primary mt-4" onClick={handleRegister} disabled={!publicKey}>
+                Register
+              </button>
+            </div>
+          )}
+        </div>
+
+        {/* deposit */}
+        <div className="flex-1 p-4 bg-base-200 rounded-lg shadow-md">
+          <h2 className="text-xl font-bold mb-4">Deposit</h2>
+          <div className="space-y-4">
+            <input
+              type="text"
+              placeholder="Amount (SOL)"
+              value={depositAmount}
+              onChange={(e) => setDepositAmount(e.target.value)}
+              className="input input-bordered w-full placeholder:text-sm"
+            />
+            <button className="btn btn-primary w-full" onClick={handleDeposit} disabled={!depositAmount}>
+              Deposit
+            </button>
+          </div>
+        </div>
+
+        {/* withdraw */}
+        <div className="flex-1 p-4 bg-base-200 rounded-lg shadow-md">
+          <h2 className="text-xl font-bold mb-4">Withdraw</h2>
+          <div className="space-y-4">
+            <input
+              type="text"
+              placeholder="Amount (SOL)"
+              value={withdrawAmount}
+              onChange={(e) => setWithdrawAmount(e.target.value)}
+              className="input input-bordered w-full placeholder:text-sm"
+            />
+            <button className="btn btn-primary w-full" onClick={handleWithdraw} disabled={!withdrawAmount}>
+              Withdraw
+            </button>
+          </div>
+        </div>
+      </div>
+
+      <div className="mb-8 p-4 bg-base-200 rounded-lg shadow-md">
+        <h2 className="text-xl font-bold mb-4">{selectedTab === 'decharge' ? 'Charge' : 'Gacha'}</h2>
+        <ProgressBar />
+
+        {events.map((event, index) => (
+          <EventJsonViewer key={index} event={event} index={index} />
+        ))}
+
+        {/* reset */}
+        {chargeStatus === 'available' && (
+          <button className="btn btn-secondary w-full mt-4" onClick={handleReset}>
+            Reset
+          </button>
+        )}
+
+        {serialNumberBytes && (
+          <div className="mt-4 p-4 bg-base-100 rounded-lg shadow-md">
+            <h2 className="text-xl font-bold mb-2">Charger Serial Number</h2>
+            <p className="break-all">{serialNumberStr}</p>
+          </div>
+        )}
+
+        <div className="mt-4 p-4 bg-base-100 rounded-lg shadow-md">
+          <h2 className="text-xl font-bold mb-2">Machine Pubkey</h2>
+          <input
+            type="text"
+            placeholder="Enter Machine Pubkey"
+            value={machinePubkey || ''}
+            onChange={(e) => setMachinePubkey(e.target.value)}
+            className="input input-bordered w-full placeholder:text-sm mt-4"
+          />
+        </div>
+
+        {/* charge */}
+        <button
+          className={`btn w-full mt-4 border-none ${
+            selectedTab === 'decharge' ? 'bg-blue-500 hover:bg-blue-600' : 'bg-pink-500 hover:bg-pink-600'
+          } text-white`}
+          onClick={handleCharge}
+          disabled={!wallet || !serialNumberBytes || !machinePubkey || isChargeDisabled || chargeStatus !== 'idle'}
+        >
+          {selectedTab === 'decharge' ? 'Start Charge' : 'Play Gacha'}
+        </button>
+
+        {/* stop */}
+        {selectedTab === 'decharge' && (
+          <button
+            className="btn w-full mt-2 bg-red-500 hover:bg-red-600 text-white border-none"
+            onClick={handleStop}
+            disabled={chargeStatus !== 'working' || !initialRequestId || isStopPending} 
+          >
+            {isStopPending ? (
+              <span className="flex items-center justify-center">
+                <svg className="animate-spin h-5 w-5 mr-2" viewBox="0 0 24 24">
+                  <path
+                    fill="currentColor"
+                    d="M12,4V1L8,5l4,4V6c3.31,0,6,2.69,6,6c0,1.01-.25,1.97-.7,2.8l1.46,1.46C19.54,15.03,20,13.57,20,12c0-4.42-3.58-8-8-8zm0,14c-3.31,0-6-2.69-6-6c0-1.01.25-1.97.7-2.8L5.24,7.74C4.46,8.97,4,10.43,4,12c0,4.42,3.58,8,8,8v3l4-4l-4-4V18z"
+                  />
+                </svg>
+                Stopping...
+              </span>
+            ) : (
+              'Stop Charge'
+            )}
+          </button>
+        )}
+
+        {recoverInfo && (
+          <div className="mt-6 p-6 bg-base-100 rounded-lg shadow-md">
+            <h2 className="text-xl font-bold mb-4">Recover Info</h2>
+            <div className="space-y-2">
+              <p>
+                <span className="font-semibold">Signature:</span>{' '}
+                <span className="break-all">{recoverInfo.signature.join(', ')}</span>
+              </p>
+              <p>
+                <span className="font-semibold">Payload:</span>{' '}
+                <span className="break-all">{recoverInfo.payload.join(', ')}</span>
+              </p>
+              <p>
+                <span className="font-semibold">Deadline:</span> <span>{recoverInfo.deadline.toString()}</span>
+              </p>
+            </div>
+          </div>
+        )}
+      </div>
+    </div>
+  ) : (
+    <div className="max-w-4xl mx-auto">
+      <div className="hero py-[64px]">
+        <div className="hero-content text-center">
+          <WalletButton />
+        </div>
+      </div>
+    </div>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-data-access.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-data-access.tsx
new file mode 100644
index 0000000..2da2f4a
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-data-access.tsx
@@ -0,0 +1,118 @@
+import { clusterApiUrl, Connection } from '@solana/web3.js'
+
+import { atom, useAtomValue, useSetAtom } from 'jotai'
+import { atomWithStorage } from 'jotai/utils'
+import { createContext, ReactNode, useContext } from 'react'
+import toast from 'react-hot-toast'
+
+export interface Cluster {
+  name: string
+  endpoint: string
+  network?: ClusterNetwork
+  active?: boolean
+}
+
+export enum ClusterNetwork {
+  Mainnet = 'mainnet-beta',
+  Testnet = 'testnet',
+  Devnet = 'devnet',
+  Custom = 'custom',
+}
+
+// By default, we don't configure the mainnet-beta cluster
+// The endpoint provided by clusterApiUrl('mainnet-beta') does not allow access from the browser due to CORS restrictions
+// To use the mainnet-beta cluster, provide a custom endpoint
+export const defaultClusters: Cluster[] = [
+  {
+    name: 'devnet',
+    endpoint: clusterApiUrl('devnet'),
+    network: ClusterNetwork.Devnet,
+  },
+  { name: 'local', endpoint: 'http://localhost:8899' },
+  {
+    name: 'testnet',
+    endpoint: clusterApiUrl('testnet'),
+    network: ClusterNetwork.Testnet,
+  },
+]
+
+const index = import.meta.env.VITE_NETWORK === "devnet" ? 0 : 1;  // default is local if `VITE_NETWORK` env not provided
+
+const clusterAtom = atomWithStorage<Cluster>('solana-cluster', defaultClusters[index])
+const clustersAtom = atomWithStorage<Cluster[]>('solana-clusters', defaultClusters)
+
+const activeClustersAtom = atom<Cluster[]>((get) => {
+  const clusters = get(clustersAtom)
+  const cluster = get(clusterAtom)
+  return clusters.map((item) => ({
+    ...item,
+    active: item.name === cluster.name,
+  }))
+})
+
+const activeClusterAtom = atom<Cluster>((get) => {
+  const clusters = get(activeClustersAtom)
+
+  return clusters.find((item) => item.active) || clusters[0]
+})
+
+export interface ClusterProviderContext {
+  cluster: Cluster
+  clusters: Cluster[]
+  addCluster: (cluster: Cluster) => void
+  deleteCluster: (cluster: Cluster) => void
+  setCluster: (cluster: Cluster) => void
+  getExplorerUrl(path: string): string
+}
+
+const Context = createContext<ClusterProviderContext>({} as ClusterProviderContext)
+
+export function ClusterProvider({ children }: { children: ReactNode }) {
+  const cluster = useAtomValue(activeClusterAtom)
+  const clusters = useAtomValue(activeClustersAtom)
+  const setCluster = useSetAtom(clusterAtom)
+  const setClusters = useSetAtom(clustersAtom)
+
+  const value: ClusterProviderContext = {
+    cluster,
+    clusters: clusters.sort((a, b) => (a.name > b.name ? 1 : -1)),
+    addCluster: (cluster: Cluster) => {
+      try {
+        new Connection(cluster.endpoint)
+        setClusters([...clusters, cluster])
+      } catch (err) {
+        toast.error(`${err}`)
+      }
+    },
+    deleteCluster: (cluster: Cluster) => {
+      setClusters(clusters.filter((item) => item.name !== cluster.name))
+    },
+    setCluster: (cluster: Cluster) => setCluster(cluster),
+    getExplorerUrl: (path: string) => `https://explorer.solana.com/${path}${getClusterUrlParam(cluster)}`,
+  }
+  return <Context.Provider value={value}>{children}</Context.Provider>
+}
+
+export function useCluster() {
+  return useContext(Context)
+}
+
+function getClusterUrlParam(cluster: Cluster): string {
+  let suffix = ''
+  switch (cluster.network) {
+    case ClusterNetwork.Devnet:
+      suffix = 'devnet'
+      break
+    case ClusterNetwork.Mainnet:
+      suffix = ''
+      break
+    case ClusterNetwork.Testnet:
+      suffix = 'testnet'
+      break
+    default:
+      suffix = `custom&customUrl=${encodeURIComponent(cluster.endpoint)}`
+      break
+  }
+
+  return suffix.length ? `?cluster=${suffix}` : ''
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-feature.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-feature.tsx
new file mode 100644
index 0000000..e7608aa
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-feature.tsx
@@ -0,0 +1,19 @@
+import { useState } from 'react'
+import { AppHero } from '../ui/ui-layout'
+import { ClusterUiModal, ClusterUiTable } from './cluster-ui'
+
+export default function ClusterFeature() {
+  const [showModal, setShowModal] = useState(false)
+
+  return (
+    <div>
+      <AppHero title="Clusters" subtitle="Manage and select your Solana clusters">
+        <ClusterUiModal show={showModal} hideModal={() => setShowModal(false)} />
+        <button className="btn btn-xs lg:btn-md btn-primary" onClick={() => setShowModal(true)}>
+          Add Cluster
+        </button>
+      </AppHero>
+      <ClusterUiTable />
+    </div>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-ui.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-ui.tsx
new file mode 100644
index 0000000..ce62148
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/cluster/cluster-ui.tsx
@@ -0,0 +1,172 @@
+import { useConnection } from '@solana/wallet-adapter-react'
+import { Connection } from '@solana/web3.js'
+import { IconTrash } from '@tabler/icons-react'
+import { useQuery } from '@tanstack/react-query'
+import { ReactNode, useState } from 'react'
+import { AppModal } from '../ui/ui-layout'
+import { ClusterNetwork, useCluster } from './cluster-data-access'
+
+export function ExplorerLink({ path, label, className }: { path: string; label: string; className?: string }) {
+  const { getExplorerUrl } = useCluster()
+  return (
+    <a
+      href={getExplorerUrl(path)}
+      target="_blank"
+      rel="noopener noreferrer"
+      className={className ? className : `link font-mono`}
+    >
+      {label}
+    </a>
+  )
+}
+
+export function ClusterChecker({ children }: { children: ReactNode }) {
+  const { cluster } = useCluster()
+  const { connection } = useConnection()
+
+  const query = useQuery({
+    queryKey: ['version', { cluster, endpoint: connection.rpcEndpoint }],
+    queryFn: () => connection.getVersion(),
+    retry: 1,
+  })
+  if (query.isLoading) {
+    return null
+  }
+  if (query.isError || !query.data) {
+    return (
+      <div className="alert alert-warning text-warning-content/80 rounded-none flex justify-center">
+        <span>
+          Error connecting to cluster <strong>{cluster.name}</strong>
+        </span>
+        <button className="btn btn-xs btn-neutral" onClick={() => query.refetch()}>
+          Refresh
+        </button>
+      </div>
+    )
+  }
+  return children
+}
+
+export function ClusterUiSelect() {
+  const { clusters, setCluster, cluster } = useCluster()
+  return (
+    <div className="dropdown dropdown-end">
+      <label tabIndex={0} className="btn btn-primary rounded-btn">
+        {cluster.name}
+      </label>
+      <ul tabIndex={0} className="menu dropdown-content z-[1] p-2 shadow bg-base-100 rounded-box w-52 mt-4">
+        {clusters.map((item) => (
+          <li key={item.name}>
+            <button
+              className={`btn btn-sm ${item.active ? 'btn-primary' : 'btn-ghost'}`}
+              onClick={() => setCluster(item)}
+            >
+              {item.name}
+            </button>
+          </li>
+        ))}
+      </ul>
+    </div>
+  )
+}
+
+export function ClusterUiModal({ hideModal, show }: { hideModal: () => void; show: boolean }) {
+  const { addCluster } = useCluster()
+  const [name, setName] = useState('')
+  const [network, setNetwork] = useState<ClusterNetwork | undefined>()
+  const [endpoint, setEndpoint] = useState('')
+
+  return (
+    <AppModal
+      title={'Add Cluster'}
+      hide={hideModal}
+      show={show}
+      submit={() => {
+        try {
+          new Connection(endpoint)
+          if (name) {
+            addCluster({ name, network, endpoint })
+            hideModal()
+          } else {
+            console.log('Invalid cluster name')
+          }
+        } catch {
+          console.log('Invalid cluster endpoint')
+        }
+      }}
+      submitLabel="Save"
+    >
+      <input
+        type="text"
+        className="input input-bordered w-full"
+        value={name}
+        onChange={(e) => setName(e.target.value)}
+      />
+      <input
+        type="text"
+        className="input input-bordered w-full"
+        value={endpoint}
+        onChange={(e) => setEndpoint(e.target.value)}
+      />
+      <select
+        className="select select-bordered w-full"
+        value={network}
+        onChange={(e) => setNetwork(e.target.value as ClusterNetwork)}
+      >
+        <option value={undefined}>Select a network</option>
+        <option value={ClusterNetwork.Devnet}>Devnet</option>
+        <option value={ClusterNetwork.Testnet}>Testnet</option>
+        <option value={ClusterNetwork.Mainnet}>Mainnet</option>
+      </select>
+    </AppModal>
+  )
+}
+
+export function ClusterUiTable() {
+  const { clusters, setCluster, deleteCluster } = useCluster()
+  return (
+    <div className="overflow-x-auto">
+      <table className="table border-4 border-separate border-base-300">
+        <thead>
+          <tr>
+            <th>Name/ Network / Endpoint</th>
+            <th className="text-center">Actions</th>
+          </tr>
+        </thead>
+        <tbody>
+          {clusters.map((item) => (
+            <tr key={item.name} className={item?.active ? 'bg-base-200' : ''}>
+              <td className="space-y-2">
+                <div className="whitespace-nowrap space-x-2">
+                  <span className="text-xl">
+                    {item?.active ? (
+                      item.name
+                    ) : (
+                      <button title="Select cluster" className="link link-secondary" onClick={() => setCluster(item)}>
+                        {item.name}
+                      </button>
+                    )}
+                  </span>
+                </div>
+                <span className="text-xs">Network: {item.network ?? 'custom'}</span>
+                <div className="whitespace-nowrap text-gray-500 text-xs">{item.endpoint}</div>
+              </td>
+              <td className="space-x-2 whitespace-nowrap text-center">
+                <button
+                  disabled={item?.active}
+                  className="btn btn-xs btn-default btn-outline"
+                  onClick={() => {
+                    if (!window.confirm('Are you sure?')) return
+                    deleteCluster(item)
+                  }}
+                >
+                  <IconTrash size={16} />
+                </button>
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/dashboard/dashboard-feature.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/dashboard/dashboard-feature.tsx
new file mode 100644
index 0000000..50b2730
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/dashboard/dashboard-feature.tsx
@@ -0,0 +1,29 @@
+import { AppHero } from '../ui/ui-layout'
+
+const links: { label: string; href: string }[] = [
+  { label: 'Solana Docs', href: 'https://docs.solana.com/' },
+  { label: 'Solana Faucet', href: 'https://faucet.solana.com/' },
+  { label: 'Solana Cookbook', href: 'https://solanacookbook.com/' },
+  { label: 'Solana Stack Overflow', href: 'https://solana.stackexchange.com/' },
+  { label: 'Solana Developers GitHub', href: 'https://github.com/solana-developers/' },
+]
+
+export default function DashboardFeature() {
+  return (
+    <div>
+      <AppHero title="gm" subtitle="Say hi to your new Solana dApp." />
+      <div className="max-w-xl mx-auto py-6 sm:px-6 lg:px-8 text-center">
+        <div className="space-y-2">
+          <p>Here are some helpful links to get you started.</p>
+          {links.map((link, index) => (
+            <div key={index}>
+              <a href={link.href} className="link" target="_blank" rel="noopener noreferrer">
+                {link.label}
+              </a>
+            </div>
+          ))}
+        </div>
+      </div>
+    </div>
+  )
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/solana/solana-provider.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/solana/solana-provider.tsx
new file mode 100644
index 0000000..b7b316e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/solana/solana-provider.tsx
@@ -0,0 +1,39 @@
+import { AnchorProvider } from '@coral-xyz/anchor'
+import { WalletError } from '@solana/wallet-adapter-base'
+import {
+  AnchorWallet,
+  ConnectionProvider,
+  useConnection,
+  useWallet,
+  WalletProvider,
+} from '@solana/wallet-adapter-react'
+import { WalletModalProvider, WalletMultiButton } from '@solana/wallet-adapter-react-ui'
+import { ReactNode, useCallback, useMemo } from 'react'
+import { useCluster } from '../cluster/cluster-data-access'
+
+import('@solana/wallet-adapter-react-ui/styles.css')
+
+export const WalletButton = WalletMultiButton
+
+export function SolanaProvider({ children }: { children: ReactNode }) {
+  const { cluster } = useCluster()
+  const endpoint = useMemo(() => cluster.endpoint, [cluster])
+  const onError = useCallback((error: WalletError) => {
+    console.error(error)
+  }, [])
+
+  return (
+    <ConnectionProvider endpoint={endpoint}>
+      <WalletProvider wallets={[]} onError={onError} autoConnect={true}>
+        <WalletModalProvider>{children}</WalletModalProvider>
+      </WalletProvider>
+    </ConnectionProvider>
+  )
+}
+
+export function useAnchorProvider() {
+  const { connection } = useConnection()
+  const wallet = useWallet()
+
+  return new AnchorProvider(connection, wallet as AnchorWallet, { commitment: 'confirmed' })
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/components/ui/ui-layout.tsx b/dephy-vending_machine-examples/balance-payment/app/src/components/ui/ui-layout.tsx
new file mode 100644
index 0000000..55df50f
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/components/ui/ui-layout.tsx
@@ -0,0 +1,156 @@
+import { ReactNode, Suspense, useEffect, useRef } from 'react'
+import toast, { Toaster } from 'react-hot-toast'
+import { Link, useLocation } from 'react-router-dom'
+
+import { AccountChecker } from '../account/account-ui'
+import { ClusterChecker, ClusterUiSelect, ExplorerLink } from '../cluster/cluster-ui'
+import { WalletButton } from '../solana/solana-provider'
+
+export function UiLayout({ children, links }: { children: ReactNode; links: { label: string; path: string }[] }) {
+  const pathname = useLocation().pathname
+
+  return (
+    <div className="h-full flex flex-col">
+      <div className="navbar bg-base-300 dark:text-neutral-content flex-col md:flex-row space-y-2 md:space-y-0">
+        <div className="flex-1">
+          <Link className="btn btn-ghost normal-case text-xl" to="/">
+            Payment
+          </Link>
+          <ul className="menu menu-horizontal px-1 space-x-2">
+            {links.map(({ label, path }) => (
+              <li key={path}>
+                <Link className={pathname.startsWith(path) ? 'active' : ''} to={path}>
+                  {label}
+                </Link>
+              </li>
+            ))}
+          </ul>
+        </div>
+        <div className="flex-none space-x-2">
+          <WalletButton />
+          <ClusterUiSelect />
+        </div>
+      </div>
+      <ClusterChecker>
+        <AccountChecker />
+      </ClusterChecker>
+      <div className="flex-grow mx-4 lg:mx-auto">
+        <Suspense
+          fallback={
+            <div className="text-center my-32">
+              <span className="loading loading-spinner loading-lg"></span>
+            </div>
+          }
+        >
+          {children}
+        </Suspense>
+        <Toaster position="bottom-right" />
+      </div>
+      <footer className="footer footer-center p-4 bg-base-300 text-base-content">
+        <aside>
+          <p>
+            Generated by{' '}
+            <a
+              className="link hover:text-white"
+              href="https://github.com/solana-developers/create-solana-dapp"
+              target="_blank"
+              rel="noopener noreferrer"
+            >
+              create-solana-dapp
+            </a>
+          </p>
+        </aside>
+      </footer>
+    </div>
+  )
+}
+
+export function AppModal({
+  children,
+  title,
+  hide,
+  show,
+  submit,
+  submitDisabled,
+  submitLabel,
+}: {
+  children: ReactNode
+  title: string
+  hide: () => void
+  show: boolean
+  submit?: () => void
+  submitDisabled?: boolean
+  submitLabel?: string
+}) {
+  const dialogRef = useRef<HTMLDialogElement | null>(null)
+
+  useEffect(() => {
+    if (!dialogRef.current) return
+    if (show) {
+      dialogRef.current.showModal()
+    } else {
+      dialogRef.current.close()
+    }
+  }, [show, dialogRef])
+
+  return (
+    <dialog className="modal" ref={dialogRef}>
+      <div className="modal-box space-y-5">
+        <h3 className="font-bold text-lg">{title}</h3>
+        {children}
+        <div className="modal-action">
+          <div className="join space-x-2">
+            {submit ? (
+              <button className="btn btn-xs lg:btn-md btn-primary" onClick={submit} disabled={submitDisabled}>
+                {submitLabel || 'Save'}
+              </button>
+            ) : null}
+            <button onClick={hide} className="btn">
+              Close
+            </button>
+          </div>
+        </div>
+      </div>
+    </dialog>
+  )
+}
+
+export function AppHero({
+  children,
+  title,
+  subtitle,
+}: {
+  children?: ReactNode
+  title: ReactNode
+  subtitle: ReactNode
+}) {
+  return (
+    <div className="hero py-[64px]">
+      <div className="hero-content text-center">
+        <div className="max-w-2xl">
+          {typeof title === 'string' ? <h1 className="text-5xl font-bold">{title}</h1> : title}
+          {typeof subtitle === 'string' ? <p className="py-6">{subtitle}</p> : subtitle}
+          {children}
+        </div>
+      </div>
+    </div>
+  )
+}
+
+export function ellipsify(str = '', len = 4) {
+  if (str.length > 30) {
+    return str.substring(0, len) + '..' + str.substring(str.length - len, str.length)
+  }
+  return str
+}
+
+export function useTransactionToast() {
+  return (signature: string) => {
+    toast.success(
+      <div className={'text-center'}>
+        <div className="text-lg">Transaction sent</div>
+        <ExplorerLink path={`tx/${signature}`} label={'View Transaction'} className="btn btn-xs btn-primary" />
+      </div>,
+    )
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/index.css b/dephy-vending_machine-examples/balance-payment/app/src/index.css
new file mode 100644
index 0000000..3ddb6b1
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/index.css
@@ -0,0 +1,20 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+html,
+body,
+#root {
+  height: 100%;
+}
+
+.wallet-adapter-button-trigger {
+  background: rgb(100, 26, 230) !important;
+  border-radius: 8px !important;
+  padding-left: 16px !important;
+  padding-right: 16px !important;
+}
+.wallet-adapter-dropdown-list,
+.wallet-adapter-button {
+  font-family: inherit !important;
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/main.tsx b/dephy-vending_machine-examples/balance-payment/app/src/main.tsx
new file mode 100644
index 0000000..7fc7e3c
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/main.tsx
@@ -0,0 +1,13 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import { BrowserRouter } from 'react-router-dom'
+import { App } from './app/app.tsx'
+import './index.css'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <BrowserRouter>
+      <App />
+    </BrowserRouter>
+  </StrictMode>,
+)
diff --git a/dephy-vending_machine-examples/balance-payment/app/src/vite-env.d.ts b/dephy-vending_machine-examples/balance-payment/app/src/vite-env.d.ts
new file mode 100644
index 0000000..11f02fe
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/src/vite-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />
diff --git a/dephy-vending_machine-examples/balance-payment/app/tailwind.config.ts b/dephy-vending_machine-examples/balance-payment/app/tailwind.config.ts
new file mode 100644
index 0000000..1ff77a0
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/tailwind.config.ts
@@ -0,0 +1,14 @@
+import type { Config } from 'tailwindcss'
+
+const config: Config = {
+  content: [
+    './src/pages/**/*.{js,ts,jsx,tsx,mdx}',
+    './src/components/**/*.{js,ts,jsx,tsx,mdx}',
+    './src/app/**/*.{js,ts,jsx,tsx,mdx}',
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [require('daisyui')],
+}
+export default config
diff --git a/dephy-vending_machine-examples/balance-payment/app/tsconfig.app.json b/dephy-vending_machine-examples/balance-payment/app/tsconfig.app.json
new file mode 100644
index 0000000..2a4ae51
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/tsconfig.app.json
@@ -0,0 +1,28 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "isolatedModules": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "paths": {
+      "@project/anchor": ["./anchor/src"],
+      "@/*": ["./src/*"]
+    }
+  },
+  "include": ["src"]
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/tsconfig.json b/dephy-vending_machine-examples/balance-payment/app/tsconfig.json
new file mode 100644
index 0000000..d32ff68
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "files": [],
+  "references": [{ "path": "./tsconfig.app.json" }, { "path": "./tsconfig.node.json" }]
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/tsconfig.node.json b/dephy-vending_machine-examples/balance-payment/app/tsconfig.node.json
new file mode 100644
index 0000000..8c880e0
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/tsconfig.node.json
@@ -0,0 +1,25 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "isolatedModules": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "paths": {
+      "@/*": ["./src/*"]
+    }
+  },
+  "include": ["vite.config.ts"]
+}
diff --git a/dephy-vending_machine-examples/balance-payment/app/vite.config.ts b/dephy-vending_machine-examples/balance-payment/app/vite.config.ts
new file mode 100644
index 0000000..84ea80d
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/app/vite.config.ts
@@ -0,0 +1,34 @@
+// import { NodeGlobalsPolyfillPlugin } from '@esbuild-plugins/node-globals-polyfill'
+import react from '@vitejs/plugin-react'
+import { defineConfig } from 'vite'
+import { nodePolyfills } from 'vite-plugin-node-polyfills'
+import viteTsconfigPaths from 'vite-tsconfig-paths' // https://vitejs.dev/config/
+
+// https://vitejs.dev/config/
+export default defineConfig({
+  build: {
+    sourcemap: false,
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          coral: ['@coral-xyz/anchor'],
+          jotai: ['jotai'],
+          react: ['react', 'react-dom'],
+          reactHotToast: ['react-hot-toast'],
+          reactRouter: ['react-router', 'react-router-dom'],
+          solanaWalletAdapters: [
+            '@solana/wallet-adapter-base',
+            '@solana/wallet-adapter-react',
+            '@solana/wallet-adapter-react-ui',
+          ],
+          tabler: ['@tabler/icons-react'],
+          tanstack: ['@tanstack/react-query'],
+        },
+      },
+    },
+  },
+  define: {
+    global: 'globalThis',
+  },
+  plugins: [viteTsconfigPaths(), react(), nodePolyfills()],
+})
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/.dockerignore b/dephy-vending_machine-examples/balance-payment/bot_example_js/.dockerignore
new file mode 100644
index 0000000..98acc26
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/.dockerignore
@@ -0,0 +1,11 @@
+target/
+tmp/
+log/
+Dockerfile
+.dockerignore
+.env
+.DS_Store
+.swp
+.vscode
+.idea
+node_modules
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/Dockerfile b/dephy-vending_machine-examples/balance-payment/bot_example_js/Dockerfile
new file mode 100644
index 0000000..f03beb5
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/Dockerfile
@@ -0,0 +1,14 @@
+# syntax=docker/dockerfile:1
+# see all versions at https://hub.docker.com/r/oven/bun/tags
+FROM oven/bun:1
+
+WORKDIR /opt/balance-payment-bot
+COPY . .
+RUN bun install --frozen-lockfile
+
+# ENV SOLANA_NETWORK="devnet"
+# ENV SOLANA_RPC="https://api.devnet.solana.com"
+
+VOLUME ["/opt/solana"]
+
+ENTRYPOINT ["bun", "run", "index.ts"]
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/README.md b/dephy-vending_machine-examples/balance-payment/bot_example_js/README.md
new file mode 100644
index 0000000..d17a6e6
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/README.md
@@ -0,0 +1,36 @@
+Bot example
+====
+
+## Prepare
+
+`bun i`
+
+## Sign Message
+
+```
+bun run index.ts sign_message --net devnet --rpc "https://api.devnet.solana.com" --keypair "./user.demo.json" --minutes 30
+```
+
+## Check Eligible
+
+```
+bun run index.ts check_eligible --net devnet --rpc "https://api.devnet.solana.com" --user "user Solana address" --amount "0.01" --nonce "nonce from request payload" --recoverInfo "User request content(Base64)"
+```
+
+## Lock
+
+```
+bun run index.ts lock --net devnet --rpc "https://api.devnet.solana.com" --keypair "./bot.demo.json" --user "user Solana address" --amount "0.01" --recoverInfo "User request content(Base64)"
+```
+
+## Settle
+
+```
+bun run index.ts settle --net devnet --rpc "https://api.devnet.solana.com" --keypair "./bot.demo.json" --user "user Solana address" --nonce "nonce related lock" --amountToTransfer "0.005"
+```
+
+## Build Docker image
+
+```
+docker build --platform linux/amd64,linux/arm64 -t balance-payment-bot .
+```
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/balance_payment.json b/dephy-vending_machine-examples/balance-payment/bot_example_js/balance_payment.json
new file mode 100644
index 0000000..ea09320
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/balance_payment.json
@@ -0,0 +1,932 @@
+{
+  "address": "GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9",
+  "metadata": {
+    "name": "balance_payment",
+    "version": "0.1.0",
+    "spec": "0.1.0",
+    "description": "Created with Anchor"
+  },
+  "instructions": [
+    {
+      "name": "deposit",
+      "discriminator": [
+        242,
+        35,
+        198,
+        137,
+        82,
+        225,
+        242,
+        182
+      ],
+      "accounts": [
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "initialize",
+      "discriminator": [
+        175,
+        175,
+        109,
+        31,
+        13,
+        152,
+        155,
+        237
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority"
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "lock",
+      "discriminator": [
+        21,
+        19,
+        208,
+        43,
+        237,
+        62,
+        255,
+        87
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "lock_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "account",
+                "path": "user_account.nonce",
+                "account": "UserAccount"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "recover_info",
+          "type": {
+            "defined": {
+              "name": "ED25519RecoverInfo"
+            }
+          }
+        },
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "pay",
+      "discriminator": [
+        119,
+        18,
+        216,
+        65,
+        192,
+        117,
+        122,
+        220
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "treasury",
+          "writable": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "recover_info",
+          "type": {
+            "defined": {
+              "name": "ED25519RecoverInfo"
+            }
+          }
+        },
+        {
+          "name": "amount_to_transfer",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "register",
+      "discriminator": [
+        211,
+        124,
+        67,
+        15,
+        211,
+        194,
+        178,
+        240
+      ],
+      "accounts": [
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "set_bot",
+      "discriminator": [
+        136,
+        185,
+        99,
+        236,
+        200,
+        131,
+        204,
+        118
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "set_treasury",
+      "discriminator": [
+        57,
+        97,
+        196,
+        95,
+        195,
+        206,
+        106,
+        136
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "settle",
+      "discriminator": [
+        175,
+        42,
+        185,
+        87,
+        144,
+        131,
+        102,
+        212
+      ],
+      "accounts": [
+        {
+          "name": "global_account",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "treasury",
+          "writable": true
+        },
+        {
+          "name": "lock_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "arg",
+                "path": "nonce"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "global_account"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "_nonce",
+          "type": "u64"
+        },
+        {
+          "name": "amount_to_transfer",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "withdraw",
+      "discriminator": [
+        183,
+        18,
+        70,
+        156,
+        148,
+        109,
+        161,
+        34
+      ],
+      "accounts": [
+        {
+          "name": "user_account",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "system_program",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    }
+  ],
+  "accounts": [
+    {
+      "name": "GlobalAccount",
+      "discriminator": [
+        129,
+        105,
+        124,
+        171,
+        189,
+        42,
+        108,
+        69
+      ]
+    },
+    {
+      "name": "LockAccount",
+      "discriminator": [
+        223,
+        64,
+        71,
+        124,
+        255,
+        86,
+        118,
+        192
+      ]
+    },
+    {
+      "name": "UserAccount",
+      "discriminator": [
+        211,
+        33,
+        136,
+        16,
+        186,
+        110,
+        242,
+        127
+      ]
+    }
+  ],
+  "errors": [
+    {
+      "code": 6000,
+      "name": "Unauthorized",
+      "msg": "Unauthorized access."
+    },
+    {
+      "code": 6001,
+      "name": "InsufficientFunds",
+      "msg": "Insufficient funds."
+    },
+    {
+      "code": 6002,
+      "name": "SignatureFormatInvalid",
+      "msg": "The signature format or recovery ID is incorrect."
+    },
+    {
+      "code": 6003,
+      "name": "SignatureRecoveryFailed",
+      "msg": "Failed to recover public key from signature."
+    },
+    {
+      "code": 6004,
+      "name": "SignatureMismatch",
+      "msg": "The recovered public key does not match the user's public key."
+    },
+    {
+      "code": 6005,
+      "name": "SignatureExpired",
+      "msg": "The signature is expired."
+    }
+  ],
+  "types": [
+    {
+      "name": "ED25519RecoverInfo",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "signature",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "payload",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "deadline",
+            "type": "i64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "GlobalAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "authority",
+            "type": "pubkey"
+          },
+          {
+            "name": "bot",
+            "type": "pubkey"
+          },
+          {
+            "name": "treasury",
+            "type": "pubkey"
+          }
+        ]
+      }
+    },
+    {
+      "name": "LockAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "amount",
+            "type": "u64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "UserAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "nonce",
+            "type": "u64"
+          },
+          {
+            "name": "locked_amount",
+            "type": "u64"
+          },
+          {
+            "name": "vault",
+            "type": "pubkey"
+          }
+        ]
+      }
+    }
+  ]
+}
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/balance_payment.ts b/dephy-vending_machine-examples/balance-payment/bot_example_js/balance_payment.ts
new file mode 100644
index 0000000..ecda99e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/balance_payment.ts
@@ -0,0 +1,938 @@
+/**
+ * Program IDL in camelCase format in order to be used in JS/TS.
+ *
+ * Note that this is only a type helper and is not the actual IDL. The original
+ * IDL can be found at `target/idl/balance_payment.json`.
+ */
+export type BalancePayment = {
+  "address": "GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9",
+  "metadata": {
+    "name": "balancePayment",
+    "version": "0.1.0",
+    "spec": "0.1.0",
+    "description": "Created with Anchor"
+  },
+  "instructions": [
+    {
+      "name": "deposit",
+      "discriminator": [
+        242,
+        35,
+        198,
+        137,
+        82,
+        225,
+        242,
+        182
+      ],
+      "accounts": [
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "initialize",
+      "discriminator": [
+        175,
+        175,
+        109,
+        31,
+        13,
+        152,
+        155,
+        237
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority"
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "lock",
+      "discriminator": [
+        21,
+        19,
+        208,
+        43,
+        237,
+        62,
+        255,
+        87
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "lockAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "account",
+                "path": "user_account.nonce",
+                "account": "userAccount"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "recoverInfo",
+          "type": {
+            "defined": {
+              "name": "ed25519RecoverInfo"
+            }
+          }
+        },
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "pay",
+      "discriminator": [
+        119,
+        18,
+        216,
+        65,
+        192,
+        117,
+        122,
+        220
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "treasury",
+          "writable": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "recoverInfo",
+          "type": {
+            "defined": {
+              "name": "ed25519RecoverInfo"
+            }
+          }
+        },
+        {
+          "name": "amountToTransfer",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "register",
+      "discriminator": [
+        211,
+        124,
+        67,
+        15,
+        211,
+        194,
+        178,
+        240
+      ],
+      "accounts": [
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "setBot",
+      "discriminator": [
+        136,
+        185,
+        99,
+        236,
+        200,
+        131,
+        204,
+        118
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "bot"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "setTreasury",
+      "discriminator": [
+        57,
+        97,
+        196,
+        95,
+        195,
+        206,
+        106,
+        136
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "authority",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "treasury"
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        }
+      ],
+      "args": []
+    },
+    {
+      "name": "settle",
+      "discriminator": [
+        175,
+        42,
+        185,
+        87,
+        144,
+        131,
+        102,
+        212
+      ],
+      "accounts": [
+        {
+          "name": "globalAccount",
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  71,
+                  76,
+                  79,
+                  66,
+                  65,
+                  76
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true
+        },
+        {
+          "name": "treasury",
+          "writable": true
+        },
+        {
+          "name": "lockAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  76,
+                  79,
+                  67,
+                  75
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              },
+              {
+                "kind": "arg",
+                "path": "nonce"
+              }
+            ]
+          }
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "bot",
+          "signer": true,
+          "relations": [
+            "globalAccount"
+          ]
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "nonce",
+          "type": "u64"
+        },
+        {
+          "name": "amountToTransfer",
+          "type": "u64"
+        }
+      ]
+    },
+    {
+      "name": "withdraw",
+      "discriminator": [
+        183,
+        18,
+        70,
+        156,
+        148,
+        109,
+        161,
+        34
+      ],
+      "accounts": [
+        {
+          "name": "userAccount",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  85,
+                  83,
+                  69,
+                  82
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "user",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "vault",
+          "writable": true,
+          "pda": {
+            "seeds": [
+              {
+                "kind": "const",
+                "value": [
+                  86,
+                  65,
+                  85,
+                  76,
+                  84
+                ]
+              },
+              {
+                "kind": "account",
+                "path": "user"
+              }
+            ]
+          }
+        },
+        {
+          "name": "payer",
+          "writable": true,
+          "signer": true
+        },
+        {
+          "name": "systemProgram",
+          "address": "11111111111111111111111111111111"
+        }
+      ],
+      "args": [
+        {
+          "name": "amount",
+          "type": "u64"
+        }
+      ]
+    }
+  ],
+  "accounts": [
+    {
+      "name": "globalAccount",
+      "discriminator": [
+        129,
+        105,
+        124,
+        171,
+        189,
+        42,
+        108,
+        69
+      ]
+    },
+    {
+      "name": "lockAccount",
+      "discriminator": [
+        223,
+        64,
+        71,
+        124,
+        255,
+        86,
+        118,
+        192
+      ]
+    },
+    {
+      "name": "userAccount",
+      "discriminator": [
+        211,
+        33,
+        136,
+        16,
+        186,
+        110,
+        242,
+        127
+      ]
+    }
+  ],
+  "errors": [
+    {
+      "code": 6000,
+      "name": "unauthorized",
+      "msg": "Unauthorized access."
+    },
+    {
+      "code": 6001,
+      "name": "insufficientFunds",
+      "msg": "Insufficient funds."
+    },
+    {
+      "code": 6002,
+      "name": "signatureFormatInvalid",
+      "msg": "The signature format or recovery ID is incorrect."
+    },
+    {
+      "code": 6003,
+      "name": "signatureRecoveryFailed",
+      "msg": "Failed to recover public key from signature."
+    },
+    {
+      "code": 6004,
+      "name": "signatureMismatch",
+      "msg": "The recovered public key does not match the user's public key."
+    },
+    {
+      "code": 6005,
+      "name": "signatureExpired",
+      "msg": "The signature is expired."
+    }
+  ],
+  "types": [
+    {
+      "name": "ed25519RecoverInfo",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "signature",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "payload",
+            "type": {
+              "array": [
+                "u8",
+                64
+              ]
+            }
+          },
+          {
+            "name": "deadline",
+            "type": "i64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "globalAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "authority",
+            "type": "pubkey"
+          },
+          {
+            "name": "bot",
+            "type": "pubkey"
+          },
+          {
+            "name": "treasury",
+            "type": "pubkey"
+          }
+        ]
+      }
+    },
+    {
+      "name": "lockAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "amount",
+            "type": "u64"
+          }
+        ]
+      }
+    },
+    {
+      "name": "userAccount",
+      "type": {
+        "kind": "struct",
+        "fields": [
+          {
+            "name": "nonce",
+            "type": "u64"
+          },
+          {
+            "name": "lockedAmount",
+            "type": "u64"
+          },
+          {
+            "name": "vault",
+            "type": "pubkey"
+          }
+        ]
+      }
+    }
+  ]
+};
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/eligible-checker b/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/eligible-checker
new file mode 100755
index 0000000..5ec95d3
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/eligible-checker
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+USER=$1
+AMOUNT=$2
+NONCE=$3
+RECOVER_INFO=$4
+
+exec bun run /opt/balance-payment-bot/index.ts check_eligible --net devnet --rpc "https://api.devnet.solana.com" --user "$USER" --amount "$AMOUNT" --nonce "$NONCE" --recoverInfo "$RECOVER_INFO"
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/locker b/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/locker
new file mode 100755
index 0000000..765c2c2
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/locker
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+USER=$1
+AMOUNT=$2
+RECOVER_INFO=$3
+
+exec bun run /opt/balance-payment-bot/index.ts lock --net devnet --rpc "https://api.devnet.solana.com" --keypair /opt/balance-payment-bot/bot.demo.json --user "$USER" --amount "$AMOUNT" --recoverInfo "$RECOVER_INFO"
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/settler b/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/settler
new file mode 100755
index 0000000..7ccab28
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/bin/settler
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+USER=$1
+NONCE=$2
+AMOUNT_TO_TRANSFER=$3
+
+exec bun run /opt/balance-payment-bot/index.ts settle --net devnet --rpc "https://api.devnet.solana.com" --keypair /opt/balance-payment-bot/bot.demo.json --user "$USER" --nonce "$NONCE" --amountToTransfer "$AMOUNT_TO_TRANSFER"
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/index.ts b/dephy-vending_machine-examples/balance-payment/bot_example_js/index.ts
new file mode 100644
index 0000000..eb62492
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/index.ts
@@ -0,0 +1,618 @@
+import * as anchor from "@coral-xyz/anchor";
+import * as ed from "@noble/ed25519";
+import { web3, Program, BN } from "@coral-xyz/anchor";
+import { BalancePayment } from "./balance_payment";
+import BalancePaymentIDL from "./balance_payment.json";
+import { Command } from "commander";
+import { v4 as uuidv4 } from "uuid";
+import {
+  Connection,
+  Keypair,
+  SendTransactionError,
+  TransactionExpiredTimeoutError,
+} from "@solana/web3.js";
+import keccak from "keccak";
+import { readFileSync } from "fs";
+import os from "os";
+import path from "path";
+import bs58 from "bs58";
+
+const cli = new Command();
+
+const initializeProviderAndProgram = (
+  net: string,
+  rpc?: string,
+  keypairPath?: string
+) => {
+  if (net !== "devnet" && net !== "mainnet-beta") {
+    throw new Error("net must be devnet or mainnet-beta");
+  }
+
+  const rpcEndpoint = rpc ?? web3.clusterApiUrl(net);
+  const connection = new web3.Connection(rpcEndpoint, "confirmed");
+
+  let provider: anchor.Provider;
+  let keypair: web3.Keypair | null = null;
+
+  if (keypairPath) {
+    keypair = getKeypair(keypairPath);
+    const wallet = new anchor.Wallet(keypair);
+    provider = new anchor.AnchorProvider(connection, wallet, {
+      commitment: "confirmed",
+    });
+  } else {
+    provider = new anchor.AnchorProvider(connection, {} as anchor.Wallet, {
+      commitment: "confirmed",
+    });
+  }
+
+  anchor.setProvider(provider);
+
+  const program = new Program(
+    {
+      ...BalancePaymentIDL,
+      address: BalancePaymentIDL.address,
+    } as BalancePayment,
+    provider
+  );
+
+  return {
+    keypair, // 如果没有 keypairPath，这里会返回 null
+    provider,
+    program,
+  };
+};
+
+type Methods = anchor.Program<BalancePayment>["methods"];
+
+const execute = async (tx: ReturnType<Methods[keyof Methods]>) => {
+  const pubkeys = await tx.pubkeys();
+  for (const [name, key] of Object.entries(pubkeys)) {
+    console.log(name, key.toBase58());
+  }
+  const signature = await tx.rpc();
+  console.log("signature", signature);
+  return { signature, pubkeys };
+};
+
+const sol = (n: number | string) => {
+  return new BN(Number(n) * web3.LAMPORTS_PER_SOL);
+};
+
+const generate64ByteUUIDPayload = (): Buffer => {
+  const uuid = uuidv4().replace(/-/g, "");
+  const uuidBuffer = Buffer.from(uuid, "hex");
+  const extendedBuffer = Buffer.concat([uuidBuffer, Buffer.alloc(48, 0)]);
+  return extendedBuffer;
+};
+
+const getKeypair = (keypairPath?: string): Keypair => {
+  // Default path: ~/.config/solana/id.json
+  const defaultPath = path.join(os.homedir(), ".config", "solana", "id.json");
+  const resolvedPath = keypairPath || defaultPath;
+
+  try {
+    const keypairFile = readFileSync(resolvedPath, "utf-8");
+    const keypair = Keypair.fromSecretKey(Buffer.from(JSON.parse(keypairFile)));
+    return keypair;
+  } catch (error) {
+    throw new Error(
+      `Failed to load keypair from ${resolvedPath}: ${error.message}`
+    );
+  }
+};
+
+const getUserAccountPubkey = (user: web3.PublicKey) => {
+  const [userAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+    [Buffer.from("USER"), user.toBuffer()],
+    new web3.PublicKey(BalancePaymentIDL.address)
+  );
+  return userAccountPubkey;
+};
+
+async function confirmTransaction(connection, txHash) {
+  const maxRetries = 10;
+  const retryInterval = 3000;
+
+  for (let i = 0; i < maxRetries; i++) {
+    const status = await connection.getSignatureStatus(txHash);
+    if (
+      status &&
+      status.value &&
+      status.value.confirmationStatus === "finalized"
+    ) {
+      return "finalized";
+    }
+    console.log(
+      `Transaction not finalized yet. Retrying in ${
+        retryInterval / 1000
+      } seconds...`
+    );
+    await sleep(retryInterval);
+  }
+
+  return "failed";
+}
+
+function sleep(ms: number) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+const SUCCESS = 0;
+const NETWORK_ERROR = 1;
+const PARAMS_ERROR = 11;
+const TRANSACTION_SEND_ERROR = 101;
+const TRANSACTION_NOT_CONFIRMED = 102;
+const TRANSACTION_UNKNOWN_ERROR = 103;
+
+const SIGN_MESSAGE_PREFIX = "DePHY vending machine/Example:\n";
+
+cli.name("cli");
+
+cli
+  .command("sign_message")
+  .requiredOption("--net <net>", "devnet | mainnet-beta")
+  .option("--rpc <rpc>", "rpc url link")
+  .requiredOption(
+    "--keypair <keypair>",
+    "Path to keypair file (default: ~/.config/solana/id.json)"
+  )
+  .requiredOption("--minutes <minutes>", "Minutes until deadline")
+  .action(async (opt) => {
+    const { keypair: userKeypair, program } = initializeProviderAndProgram(
+      opt.net,
+      opt.rpc,
+      opt.keypair
+    );
+
+    const user = userKeypair.publicKey; // Use the public key from the provided keypair
+
+    // Log the user who is signing
+    console.log("Signing user:", user.toBase58());
+
+    // Get nonce from user account
+    const userAccountPubkey = getUserAccountPubkey(user);
+    const userAccount = await program.account.userAccount.fetch(
+      userAccountPubkey
+    );
+
+    console.log("Signing nonce:", userAccount.nonce.toNumber());
+
+    // Convert minutes to deadline (current timestamp + minutes * 60 seconds)
+    const currentTimestamp = Math.floor(Date.now() / 1000);
+    const deadline = new BN(currentTimestamp + Number(opt.minutes) * 60);
+
+    // Generate payload
+    const payload = generate64ByteUUIDPayload();
+
+    // Create message
+    const message = Buffer.concat([
+      payload,
+      userAccount.nonce.toArrayLike(Buffer, "le", 8),
+      deadline.toArrayLike(Buffer, "le", 8),
+    ]);
+
+    // Hash the message and generate digest
+    const messageHash = keccak("keccak256").update(message).digest();
+    const hashedMessageBase58 = bs58.encode(messageHash);
+    const digest = new TextEncoder().encode(
+      `${SIGN_MESSAGE_PREFIX}${hashedMessageBase58}`
+    );
+
+    // Get user's private key
+    const privateKey = userKeypair.secretKey.slice(0, 32); // First 32 bytes are the private key
+
+    // Sign the message
+    const signature = await ed.signAsync(digest, privateKey);
+
+    // Create recoverInfo
+    const recoverInfo = {
+      signature: Array.from(signature),
+      payload: Array.from(payload),
+      deadline,
+    };
+
+    // Output recoverInfo as JSON
+    const jsonString = JSON.stringify(recoverInfo);
+    console.log("Recover Info (JSON):", jsonString);
+
+    const base64String = Buffer.from(jsonString).toString("base64");
+    console.log("Recover Info (Base64):", base64String);
+  });
+
+cli
+  .command("check_eligible")
+  .requiredOption("--net <net>", "devnet | mainnet-beta")
+  .option("--rpc <rpc>", "rpc url link")
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--nonce <nonce>", "Nonce from request paylaod")
+  .requiredOption("--amount <amount>", "Amount in SOL")
+  .requiredOption("--recoverInfo <recoverInfo>", "Recover Info (Base64)")
+  .action(async (opt) => {
+    const check = async (opt) => {
+      try {
+        const lockAmount = sol(opt.amount);
+        const recoverInfo = JSON.parse(
+          Buffer.from(opt.recoverInfo, "base64").toString()
+        );
+        const userPubkey = new web3.PublicKey(opt.user);
+
+        const { program, provider } = initializeProviderAndProgram(
+          opt.net,
+          opt.rpc,
+          opt.keypair
+        );
+
+        const userAccountPubkey = getUserAccountPubkey(userPubkey);
+
+        const userAccount = await program.account.userAccount.fetch(
+          userAccountPubkey
+        );
+
+        // 0.check nonce from request payload whether equal to nonce on chain
+        if (userAccount.nonce.toNumber() !== parseInt(opt.nonce, 10)) {
+          return false;
+        }
+
+        // 1.concat message, nonce is from blockchain
+        const message = Buffer.concat([
+          Buffer.from(recoverInfo.payload),
+          userAccount.nonce.toArrayLike(Buffer, "le", 8),
+          new BN(recoverInfo.deadline, "hex").toArrayLike(Buffer, "le", 8),
+        ]);
+
+        // 2.hash message and generate digest
+        const messageHash = keccak("keccak256").update(message).digest();
+        const hashedMessageBase58 = bs58.encode(messageHash);
+        const digest = new TextEncoder().encode(
+          `${SIGN_MESSAGE_PREFIX}${hashedMessageBase58}`
+        );
+
+        // 3.verify signature source
+        const isValid = await ed.verifyAsync(
+          Buffer.from(recoverInfo.signature),
+          digest,
+          userPubkey.toBytes()
+        );
+        if (!isValid) {
+          return false;
+        }
+
+        // 4.verify deadline expiration
+        const currentTimestamp = Math.floor(Date.now() / 1000);
+        const deadlineTimestamp = new BN(
+          recoverInfo.deadline,
+          "hex"
+        ).toNumber();
+        if (currentTimestamp >= deadlineTimestamp) {
+          return false;
+        }
+
+        // 5.verify available balance
+        const userVaultBalance = new BN(
+          await provider.connection.getBalance(userAccount.vault)
+        );
+        const availableBalance = userVaultBalance.sub(userAccount.lockedAmount);
+        if (availableBalance.lt(lockAmount)) {
+          return false;
+        }
+
+        return true;
+      } catch (e) {
+        console.error("check eligibility error happened,", e);
+        return false;
+      }
+    };
+    const result = await check(opt);
+    console.log(result);
+    process.exit(result ? 0 : 1);
+  });
+
+cli
+  .command("lock")
+  .requiredOption("--net <net>", "devnet | mainnet-beta")
+  .option("--rpc <rpc>", "rpc url link")
+  .requiredOption(
+    "--keypair <keypair>",
+    "Path to keypair file (default: ~/.config/solana/id.json)"
+  )
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--amount <amount>", "Amount in SOL")
+  .requiredOption("--recoverInfo <recoverInfo>", "Recover Info (Base64)")
+  .action(async (opt) => {
+    const { program } = initializeProviderAndProgram(
+      opt.net,
+      opt.rpc,
+      opt.keypair
+    );
+
+    let user: web3.PublicKey, nonce: BN, amount: BN, recoverInfo: any;
+    try {
+      user = new web3.PublicKey(opt.user);
+      nonce = new BN(opt.nonce);
+      amount = sol(opt.amount);
+      recoverInfo = JSON.parse(
+        Buffer.from(opt.recoverInfo, "base64").toString()
+      );
+    } catch (error) {
+      console.error("Parameter parsing error:", error);
+      process.exit(PARAMS_ERROR); // 参数解析错误
+    }
+
+    // 处理 recoverInfo
+    try {
+      recoverInfo.signature = Array.from(recoverInfo.signature);
+      recoverInfo.payload = Array.from(recoverInfo.payload);
+      recoverInfo.deadline = new BN(recoverInfo.deadline, "hex");
+    } catch (error) {
+      console.error("RecoverInfo parsing error:", error);
+      process.exit(PARAMS_ERROR); // 参数解析错误
+    }
+
+    const [globalAccountPubkey] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("GLOBAL")],
+      program.programId
+    );
+    let globalAccount: any;
+    try {
+      globalAccount = await program.account.globalAccount.fetch(
+        globalAccountPubkey
+      );
+    } catch (error) {
+      console.error("Failed to fetch global account:", error);
+      process.exit(NETWORK_ERROR); // 网络或账户获取错误
+    }
+
+    const tx = program.methods.lock(recoverInfo, amount).accountsPartial({
+      user,
+      bot: globalAccount.bot,
+    });
+
+    try {
+      await execute(tx);
+      console.log("Lock transaction completed successfully.");
+    } catch (error) {
+      if (error instanceof SendTransactionError) {
+        console.error("Smart contract reverted:", error);
+        process.exit(TRANSACTION_SEND_ERROR); // 交易发送失败
+      } else if (error instanceof TransactionExpiredTimeoutError) {
+        const txHash = error.signature;
+        console.log(
+          `Transaction expired but may have succeeded. Checking status for tx hash: ${txHash}`
+        );
+
+        const connection = new Connection(
+          opt.rpc || "https://api.devnet.solana.com"
+        );
+        const status = await confirmTransaction(connection, txHash);
+
+        if (status === "finalized") {
+          console.log("Transaction finalized successfully.");
+        } else {
+          console.error("Transaction failed or could not be finalized.");
+          process.exit(TRANSACTION_NOT_CONFIRMED);
+        }
+      } else {
+        console.error("Error during lock transaction:", error);
+        process.exit(TRANSACTION_UNKNOWN_ERROR);
+      }
+    }
+
+    process.exit(SUCCESS);
+  });
+
+cli
+  .command("settle")
+  .requiredOption("--net <net>", "devnet | mainnet-beta")
+  .option("--rpc <rpc>", "rpc url link")
+  .requiredOption(
+    "--keypair <keypair>",
+    "Path to keypair file (default: ~/.config/solana/id.json)"
+  )
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--nonce <nonce>", "Nonce")
+  .requiredOption("--amountToTransfer <amountToTransfer>", "Amount in SOL")
+  .action(async (opt) => {
+    const { program } = initializeProviderAndProgram(
+      opt.net,
+      opt.rpc,
+      opt.keypair
+    );
+
+    let user: web3.PublicKey, nonce: BN, amountToTransfer: BN;
+    try {
+      user = new web3.PublicKey(opt.user);
+      nonce = new BN(opt.nonce);
+      amountToTransfer = sol(opt.amountToTransfer);
+    } catch (error) {
+      console.error("Parameter parsing error:", error);
+      process.exit(PARAMS_ERROR);
+    }
+
+    let globalAccountPubkey: web3.PublicKey, globalAccount: any;
+    try {
+      [globalAccountPubkey] = web3.PublicKey.findProgramAddressSync(
+        [Buffer.from("GLOBAL")],
+        program.programId
+      );
+      globalAccount = await program.account.globalAccount.fetch(
+        globalAccountPubkey
+      );
+    } catch (error) {
+      console.error("Failed to fetch global account:", error);
+      process.exit(NETWORK_ERROR);
+    }
+
+    let userAccountPubkey: web3.PublicKey, userAccount: any;
+    try {
+      userAccountPubkey = getUserAccountPubkey(userAccountPubkey);
+      userAccount = await program.account.userAccount.fetch(userAccountPubkey);
+    } catch (error) {
+      console.error("Failed to fetch user account:", error);
+      process.exit(NETWORK_ERROR);
+    }
+
+    if (nonce.gte(userAccount.nonce)) {
+      console.error(
+        `nonce too large: ${nonce.toNumber()} >= ${userAccount.nonce.toNumber()}}`
+      );
+      process.exit(PARAMS_ERROR);
+    }
+
+    const [lockAccountPubkey] = web3.PublicKey.findProgramAddressSync(
+      [
+        Buffer.from("LOCK"),
+        user.toBuffer(),
+        nonce.toArrayLike(Buffer, "le", 8),
+      ],
+      program.programId
+    );
+    try {
+      await program.account.lockAccount.fetch(lockAccountPubkey);
+    } catch (error) {
+      if (
+        error.message.includes("Account does not exist") &&
+        nonce.lt(userAccount.nonce)
+      ) {
+        console.log("Lock already been settled");
+        process.exit(SUCCESS);
+      } else {
+        console.error("Fetch lock account error:", error);
+        process.exit(NETWORK_ERROR);
+      }
+    }
+
+    const tx = program.methods.settle(nonce, amountToTransfer).accountsPartial({
+      user,
+      treasury: globalAccount.treasury,
+      bot: globalAccount.bot,
+    });
+
+    try {
+      await execute(tx);
+      console.log("Settle transaction completed successfully.");
+    } catch (error) {
+      if (error instanceof SendTransactionError) {
+        console.error("Smart contract reverted:", error);
+        process.exit(TRANSACTION_SEND_ERROR);
+      } else if (error instanceof TransactionExpiredTimeoutError) {
+        const txHash = error.signature;
+        console.log(
+          `Transaction expired but may have succeeded. Checking status for tx hash: ${txHash}`
+        );
+
+        const connection = new Connection(
+          opt.rpc || "https://api.devnet.solana.com"
+        );
+        const status = await confirmTransaction(connection, txHash);
+
+        if (status === "finalized") {
+          console.log("Transaction finalized successfully.");
+        } else {
+          console.error("Transaction failed or could not be finalized.");
+          process.exit(TRANSACTION_NOT_CONFIRMED); // 返回非零退出码表示失败
+        }
+      } else {
+        console.error("Error during settle transaction:", error);
+        process.exit(TRANSACTION_UNKNOWN_ERROR); // 返回非零退出码表示失败
+      }
+    }
+
+    process.exit(SUCCESS);
+  });
+
+cli
+  .command("pay")
+  .requiredOption("--net <net>", "devnet | mainnet-beta")
+  .option("--rpc <rpc>", "rpc url link")
+  .requiredOption(
+    "--keypair <keypair>",
+    "Path to keypair file (default: ~/.config/solana/id.json)"
+  )
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--amountToTransfer <amountToTransfer>", "Amount in SOL")
+  .requiredOption("--recoverInfo <recoverInfo>", "Recover Info (Base64)")
+  .action(async (opt) => {
+    const { program } = initializeProviderAndProgram(
+      opt.net,
+      opt.rpc,
+      opt.keypair
+    );
+
+    let user: web3.PublicKey, nonce: BN, amountToTransfer: BN, recoverInfo: any;
+    try {
+      user = new web3.PublicKey(opt.user);
+      nonce = new BN(opt.nonce);
+      amountToTransfer = sol(opt.amountToTransfer);
+      recoverInfo = JSON.parse(
+        Buffer.from(opt.recoverInfo, "base64").toString()
+      );
+    } catch (error) {
+      console.error("Parameter parsing error:", error);
+      process.exit(PARAMS_ERROR); // 参数解析错误
+    }
+
+    // 处理 recoverInfo
+    try {
+      recoverInfo.signature = Array.from(recoverInfo.signature);
+      recoverInfo.payload = Array.from(recoverInfo.payload);
+      recoverInfo.deadline = new BN(recoverInfo.deadline, "hex");
+    } catch (error) {
+      console.error("RecoverInfo parsing error:", error);
+      process.exit(PARAMS_ERROR); // 参数解析错误
+    }
+
+    const [globalAccountPubkey] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("GLOBAL")],
+      program.programId
+    );
+    let globalAccount: any;
+    try {
+      globalAccount = await program.account.globalAccount.fetch(
+        globalAccountPubkey
+      );
+    } catch (error) {
+      console.error("Failed to fetch global account:", error);
+      process.exit(NETWORK_ERROR); // 网络或账户获取错误
+    }
+
+    const tx = program.methods.pay(recoverInfo, amountToTransfer).accountsPartial({
+      user,
+      treasury: globalAccount.treasury,
+      bot: globalAccount.bot,
+    });
+
+    try {
+      await execute(tx);
+      console.log("Pay transaction completed successfully.");
+    } catch (error) {
+      if (error instanceof SendTransactionError) {
+        console.error("Smart contract reverted:", error);
+        process.exit(TRANSACTION_SEND_ERROR); // 交易发送失败
+      } else if (error instanceof TransactionExpiredTimeoutError) {
+        const txHash = error.signature;
+        console.log(
+          `Transaction expired but may have succeeded. Checking status for tx hash: ${txHash}`
+        );
+
+        const connection = new Connection(
+          opt.rpc || "https://api.devnet.solana.com"
+        );
+        const status = await confirmTransaction(connection, txHash);
+
+        if (status === "finalized") {
+          console.log("Transaction finalized successfully.");
+        } else {
+          console.error("Transaction failed or could not be finalized.");
+          process.exit(TRANSACTION_NOT_CONFIRMED);
+        }
+      } else {
+        console.error("Error during lock transaction:", error);
+        process.exit(TRANSACTION_UNKNOWN_ERROR);
+      }
+    }
+
+    process.exit(SUCCESS);
+  });
+
+cli.parse();
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/package.json b/dephy-vending_machine-examples/balance-payment/bot_example_js/package.json
new file mode 100644
index 0000000..cd0150b
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/package.json
@@ -0,0 +1,27 @@
+{
+  "license": "ISC",
+  "scripts": {
+    "lint:fix": "prettier */*.js \"*/**/*{.js,.ts}\" -w",
+    "lint": "prettier */*.js \"*/**/*{.js,.ts}\" --check"
+  },
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.31.0",
+    "@noble/ed25519": "^2.2.2",
+    "@solana/web3.js": "^1.98.0",
+    "bs58": "^6.0.0",
+    "commander": "^13.0.0",
+    "keccak": "^3.0.4"
+  },
+  "devDependencies": {
+    "@types/bn.js": "^5.1.0",
+    "@types/chai": "^4.3.0",
+    "@types/keccak": "^3.0.5",
+    "@types/mocha": "^9.0.0",
+    "@types/secp256k1": "^4.0.6",
+    "chai": "^4.3.4",
+    "mocha": "^9.0.3",
+    "prettier": "^2.6.2",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/bot_example_js/tsconfig.json b/dephy-vending_machine-examples/balance-payment/bot_example_js/tsconfig.json
new file mode 100644
index 0000000..247d160
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/bot_example_js/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "types": ["mocha", "chai"],
+    "typeRoots": ["./node_modules/@types"],
+    "lib": ["es2015"],
+    "module": "commonjs",
+    "target": "es6",
+    "esModuleInterop": true,
+    "resolveJsonModule": true
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/migrations/deploy.ts b/dephy-vending_machine-examples/balance-payment/migrations/deploy.ts
new file mode 100644
index 0000000..82fb175
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/migrations/deploy.ts
@@ -0,0 +1,12 @@
+// Migrations are an early feature. Currently, they're nothing more than this
+// single deploy script that's invoked from the CLI, injecting a provider
+// configured from the workspace's Anchor.toml.
+
+const anchor = require("@coral-xyz/anchor");
+
+module.exports = async function (provider) {
+  // Configure client to use the provider.
+  anchor.setProvider(provider);
+
+  // Add your deploy script here.
+};
diff --git a/dephy-vending_machine-examples/balance-payment/package.json b/dephy-vending_machine-examples/balance-payment/package.json
new file mode 100644
index 0000000..14a4860
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/package.json
@@ -0,0 +1,30 @@
+{
+  "license": "ISC",
+  "scripts": {
+    "lint:fix": "prettier */*.js \"*/**/*{.js,.ts}\" -w",
+    "lint": "prettier */*.js \"*/**/*{.js,.ts}\" --check"
+  },
+  "dependencies": {
+    "@coral-xyz/anchor": "^0.31.0",
+    "@solana/web3.js": "^1.98.0"
+  },
+  "devDependencies": {
+    "@noble/ed25519": "^2.2.2",
+    "@types/bn.js": "^5.1.0",
+    "@types/chai": "^4.3.0",
+    "@types/keccak": "^3.0.5",
+    "@types/mocha": "^9.0.0",
+    "@types/secp256k1": "^4.0.6",
+    "bs58": "^6.0.0",
+    "chai": "^4.3.4",
+    "commander": "^13.0.0",
+    "keccak": "^3.0.4",
+    "mocha": "^9.0.3",
+    "prettier": "^2.6.2",
+    "ts-mocha": "^10.0.0",
+    "typescript": "^4.3.5"
+  },
+  "overrides": {
+    "@solana/buffer-layout": "^4.0.1"
+  }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/Cargo.toml b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/Cargo.toml
new file mode 100644
index 0000000..44c9089
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+name = "balance-payment"
+version = "0.1.0"
+description = "Created with Anchor"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "balance_payment"
+
+[features]
+default = []
+cpi = ["no-entrypoint"]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+idl-build = ["anchor-lang/idl-build"]
+
+[dependencies]
+anchor-lang = { version = "0.31.0" }
+anyhow = "1"
+arrayref = "*"
+bs58 = "0.4"
+curve25519-dalek = { version = "4", default-features = false }
+sha2 = "0.10.8"
+solana-zk-token-sdk = "^2.0.2"
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/Xargo.toml b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/Xargo.toml
new file mode 100644
index 0000000..475fb71
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/Xargo.toml
@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/keypair.json b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/keypair.json
new file mode 100644
index 0000000..9c16f48
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/keypair.json
@@ -0,0 +1 @@
+[118,171,22,138,219,238,43,55,2,144,166,47,140,179,126,103,91,80,241,45,49,251,228,181,187,228,111,60,141,175,91,161,233,24,77,228,82,49,123,133,27,66,243,147,119,224,89,94,109,109,160,165,223,142,1,104,207,96,236,176,122,11,134,82]
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/constants.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/constants.rs
new file mode 100644
index 0000000..ccb0955
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/constants.rs
@@ -0,0 +1,2 @@
+pub const DISCRIMINATOR_SIZE: usize = 8;
+pub const SIGN_MESSAGE_PREFIX: &[u8; 31] = b"DePHY vending machine/Example:\n";
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/errors.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/errors.rs
new file mode 100644
index 0000000..3803c8e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/errors.rs
@@ -0,0 +1,17 @@
+use anchor_lang::error_code;
+
+#[error_code]
+pub enum CustomError {
+    #[msg("Unauthorized access.")]
+    Unauthorized,
+    #[msg("Insufficient funds.")]
+    InsufficientFunds,
+    #[msg("The signature format or recovery ID is incorrect.")]
+    SignatureFormatInvalid,
+    #[msg("Failed to recover public key from signature.")]
+    SignatureRecoveryFailed,
+    #[msg("The recovered public key does not match the user's public key.")]
+    SignatureMismatch,
+    #[msg("The signature is expired.")]
+    SignatureExpired,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/deposit.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/deposit.rs
new file mode 100644
index 0000000..25eb90f
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/deposit.rs
@@ -0,0 +1,33 @@
+use crate::state::UserAccount;
+use anchor_lang::{prelude::*, system_program};
+
+pub fn deposit(ctx: Context<Deposit>, amount: u64) -> Result<()> {
+    system_program::transfer(
+        CpiContext::new_with_signer(
+            ctx.accounts.system_program.to_account_info(),
+            system_program::Transfer {
+                from: ctx.accounts.user.to_account_info(),
+                to: ctx.accounts.vault.to_account_info(),
+            },
+            &[],
+        ),
+        amount,
+    )?;
+
+    Ok(())
+}
+
+
+#[derive(Accounts)]
+pub struct Deposit<'info> {
+    #[account(mut, seeds = [b"USER", user.key.as_ref()], bump)]
+    pub user_account: Account<'info, UserAccount>,
+    #[account(mut)]
+    pub user: Signer<'info>,
+    /// CHECK:
+    #[account(mut, seeds = [b"VAULT", user.key().as_ref()], bump)]
+    pub vault: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/initialize.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/initialize.rs
new file mode 100644
index 0000000..7447a96
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/initialize.rs
@@ -0,0 +1,29 @@
+use crate::constants::DISCRIMINATOR_SIZE;
+use crate::state::GlobalAccount;
+use anchor_lang::prelude::*;
+
+pub fn initialize(ctx: Context<Initialize>) -> Result<()> {
+    let global_account = &mut ctx.accounts.global_account;
+    global_account.authority = ctx.accounts.authority.key();
+    global_account.bot = ctx.accounts.bot.key();
+    global_account.treasury = ctx.accounts.treasury.key();
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct Initialize<'info> {
+    #[account(init, payer = payer, space = DISCRIMINATOR_SIZE + GlobalAccount::INIT_SPACE, seeds = [b"GLOBAL"], bump)]
+    pub global_account: Account<'info, GlobalAccount>,
+    /// CHECK:
+    #[account(constraint = authority.data_is_empty())]
+    pub authority: UncheckedAccount<'info>,
+    /// CHECK:
+    #[account(constraint = treasury.data_is_empty())]
+    pub treasury: UncheckedAccount<'info>,
+    /// CHECK:
+    #[account(constraint = bot.data_is_empty())]
+    pub bot: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/lock.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/lock.rs
new file mode 100644
index 0000000..293b94a
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/lock.rs
@@ -0,0 +1,98 @@
+use crate::{
+    constants::{self, DISCRIMINATOR_SIZE},
+    errors::CustomError,
+    state::{GlobalAccount, LockAccount, UserAccount},
+    utils,
+};
+use anchor_lang::{prelude::*, solana_program::keccak};
+use bs58;
+
+pub fn lock(ctx: Context<Lock>, recover_info: ED25519RecoverInfo, amount: u64) -> Result<()> {
+    let user_account = &mut ctx.accounts.user_account;
+    let lock_account = &mut ctx.accounts.lock_account;
+
+    recover_info.verify(user_account.nonce, &ctx.accounts.user.key())?;
+
+    require!(
+        ctx.accounts.vault.get_lamports() - user_account.locked_amount >= amount,
+        CustomError::InsufficientFunds
+    );
+
+    user_account.nonce += 1;
+    user_account.locked_amount += amount;
+
+    lock_account.amount = amount;
+
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct Lock<'info> {
+    #[account(has_one = bot @ CustomError::Unauthorized, seeds = [b"GLOBAL"], bump)]
+    pub global_account: Account<'info, GlobalAccount>,
+    #[account(mut, seeds = [b"USER", user.key.as_ref()], bump)]
+    pub user_account: Account<'info, UserAccount>,
+    /// CHECK:
+    #[account(mut)]
+    pub user: UncheckedAccount<'info>,
+    #[account(
+        init,
+        payer = payer,
+        space = DISCRIMINATOR_SIZE + LockAccount::INIT_SPACE,
+        seeds = [b"LOCK", user.key().as_ref(), user_account.nonce.to_le_bytes().as_ref()],
+        bump,
+    )]
+    pub lock_account: Account<'info, LockAccount>,
+    /// CHECK:
+    #[account(seeds = [b"VAULT", user.key().as_ref()], bump)]
+    pub vault: UncheckedAccount<'info>,
+    pub bot: Signer<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
+
+#[derive(Debug, Clone, AnchorSerialize, AnchorDeserialize)]
+pub struct ED25519RecoverInfo {
+    pub signature: [u8; 64],
+    pub payload: [u8; 64],
+    pub deadline: i64,
+}
+
+impl ED25519RecoverInfo {
+    pub fn verify(&self, nonce: u64, pubkey: &Pubkey) -> Result<()> {
+        let message = {
+            let mut data = self.payload.to_vec();
+            data.extend_from_slice(&nonce.to_le_bytes());
+            data.extend_from_slice(&self.deadline.to_le_bytes());
+            data
+        };
+
+        let hashed_message = {
+            let mut hasher = keccak::Hasher::default();
+            hasher.hash(&message);
+            hasher.result().to_bytes()
+        };
+
+        let hashed_message_base58 = bs58::encode(&hashed_message).into_vec();
+
+        let digest = {
+            let mut data = constants::SIGN_MESSAGE_PREFIX.to_vec(); // 前缀转换为 Vec<u8>
+            data.extend_from_slice(&hashed_message_base58); // 添加 Base58 编码的哈希值
+            data
+        };
+
+        let valid = utils::verify_signature(pubkey, &self.signature, &digest)
+            .map_err(|_| CustomError::SignatureFormatInvalid)?;
+
+        require!(valid, CustomError::SignatureMismatch);
+
+        let clock = Clock::get()?;
+        require!(
+            clock.unix_timestamp <= self.deadline,
+            CustomError::SignatureExpired
+        );
+
+        Ok(())
+    }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/mod.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/mod.rs
new file mode 100644
index 0000000..77c4668
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/mod.rs
@@ -0,0 +1,19 @@
+pub mod initialize;
+pub mod set_bot;
+pub mod set_treasury;
+pub mod register;
+pub mod deposit;
+pub mod withdraw;
+pub mod lock;
+pub mod settle;
+pub mod pay;
+
+pub use initialize::*;
+pub use set_bot::*;
+pub use set_treasury::*;
+pub use register::*;
+pub use deposit::*;
+pub use withdraw::*;
+pub use lock::*;
+pub use settle::*;
+pub use pay::*;
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/pay.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/pay.rs
new file mode 100644
index 0000000..121333b
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/pay.rs
@@ -0,0 +1,63 @@
+use crate::{
+    errors::CustomError,
+    state::{GlobalAccount, UserAccount},
+};
+use anchor_lang::{prelude::*, system_program};
+
+use super::ED25519RecoverInfo;
+
+pub fn pay(
+    ctx: Context<Pay>,
+    recover_info: ED25519RecoverInfo,
+    amount_to_transfer: u64,
+) -> Result<()> {
+    let user_account = &mut ctx.accounts.user_account;
+
+    recover_info.verify(user_account.nonce, &ctx.accounts.user.key())?;
+
+    require!(
+        ctx.accounts.vault.get_lamports() - user_account.locked_amount >= amount_to_transfer,
+        CustomError::InsufficientFunds
+    );
+
+    system_program::transfer(
+        CpiContext::new_with_signer(
+            ctx.accounts.system_program.to_account_info(),
+            system_program::Transfer {
+                from: ctx.accounts.vault.to_account_info(),
+                to: ctx.accounts.treasury.to_account_info(),
+            },
+            &[&[
+                b"VAULT",
+                ctx.accounts.user.key().as_ref(),
+                &[ctx.bumps.vault],
+            ]],
+        ),
+        amount_to_transfer,
+    )?;
+
+    user_account.nonce += 1;
+
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct Pay<'info> {
+    #[account(has_one = bot @ CustomError::Unauthorized, seeds = [b"GLOBAL"], bump)]
+    pub global_account: Account<'info, GlobalAccount>,
+    #[account(mut, seeds = [b"USER", user.key.as_ref()], bump)]
+    pub user_account: Account<'info, UserAccount>,
+    /// CHECK:
+    #[account(mut)]
+    pub user: UncheckedAccount<'info>,
+    /// CHECK:
+    #[account(mut, constraint = treasury.key() == global_account.treasury)]
+    pub treasury: UncheckedAccount<'info>,
+    /// CHECK:
+    #[account(mut, seeds = [b"VAULT", user.key().as_ref()], bump)]
+    pub vault: UncheckedAccount<'info>,
+    pub bot: Signer<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/register.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/register.rs
new file mode 100644
index 0000000..74ca712
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/register.rs
@@ -0,0 +1,24 @@
+use crate::constants::DISCRIMINATOR_SIZE;
+use crate::state::UserAccount;
+use anchor_lang::prelude::*;
+
+pub fn register(ctx: Context<Register>) -> Result<()> {
+    let user_account = &mut ctx.accounts.user_account;
+    user_account.nonce = 0;
+    user_account.locked_amount = 0;
+    user_account.vault = ctx.accounts.vault.key();
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct Register<'info> {
+    #[account(init, payer = payer, space = DISCRIMINATOR_SIZE + UserAccount::INIT_SPACE, seeds = [b"USER", user.key.as_ref()], bump)]
+    pub user_account: Account<'info, UserAccount>,
+    pub user: Signer<'info>,
+    /// CHECK: vault is only used for store SOL
+    #[account(constraint = vault.data_is_empty(), seeds = [b"VAULT", user.key().as_ref()], bump)]
+    pub vault: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/set_bot.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/set_bot.rs
new file mode 100644
index 0000000..923aecb
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/set_bot.rs
@@ -0,0 +1,21 @@
+use crate::errors::CustomError;
+use crate::state::GlobalAccount;
+use anchor_lang::prelude::*;
+
+pub fn set_bot(ctx: Context<SetBot>) -> Result<()> {
+    let global_account = &mut ctx.accounts.global_account;
+    global_account.bot = ctx.accounts.bot.key();
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct SetBot<'info> {
+    #[account(mut, has_one = authority @ CustomError::Unauthorized, seeds = [b"GLOBAL"], bump)]
+    pub global_account: Account<'info, GlobalAccount>,
+    pub authority: Signer<'info>,
+    /// CHECK:
+    #[account(constraint = bot.data_is_empty())]
+    pub bot: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/set_treasury.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/set_treasury.rs
new file mode 100644
index 0000000..72a59e3
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/set_treasury.rs
@@ -0,0 +1,21 @@
+use crate::errors::CustomError;
+use crate::state::GlobalAccount;
+use anchor_lang::prelude::*;
+
+pub fn set_treasury(ctx: Context<SetTreasury>) -> Result<()> {
+    let global_account = &mut ctx.accounts.global_account;
+    global_account.treasury = ctx.accounts.treasury.key();
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct SetTreasury<'info> {
+    #[account(mut, has_one = authority @ CustomError::Unauthorized, seeds = [b"GLOBAL"], bump)]
+    pub global_account: Account<'info, GlobalAccount>,
+    pub authority: Signer<'info>,
+    /// CHECK:
+    #[account(constraint = treasury.data_is_empty())]
+    pub treasury: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/settle.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/settle.rs
new file mode 100644
index 0000000..7c3370d
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/settle.rs
@@ -0,0 +1,75 @@
+use crate::{
+    errors::CustomError,
+    state::{GlobalAccount, LockAccount, UserAccount},
+};
+use anchor_lang::{prelude::*, system_program};
+
+pub fn settle(ctx: Context<Settle>, _nonce: u64, amount_to_transfer: u64) -> Result<()> {
+    let user_account = &mut ctx.accounts.user_account;
+    let lock_account = &mut ctx.accounts.lock_account;
+
+    require!(
+        lock_account.amount >= amount_to_transfer,
+        CustomError::InsufficientFunds
+    );
+
+    user_account.locked_amount -= lock_account.amount;
+
+    system_program::transfer(
+        CpiContext::new_with_signer(
+            ctx.accounts.system_program.to_account_info(),
+            system_program::Transfer {
+                from: ctx.accounts.vault.to_account_info(),
+                to: ctx.accounts.treasury.to_account_info(),
+            },
+            &[&[
+                b"VAULT",
+                ctx.accounts.user.key().as_ref(),
+                &[ctx.bumps.vault],
+            ]],
+        ),
+        amount_to_transfer,
+    )?;
+
+    // Close the lock account and transfer the rent to the payer
+    let lock_account_info = lock_account.to_account_info();
+    let payer_info = ctx.accounts.payer.to_account_info();
+    let rent = Rent::get()?;
+    let lamports = rent.minimum_balance(lock_account_info.data_len());
+
+    **lock_account_info.lamports.borrow_mut() -= lamports;
+    **payer_info.lamports.borrow_mut() += lamports;
+
+    lock_account_info.assign(&system_program::ID);
+    lock_account_info.realloc(0, false)?;
+
+    Ok(())
+}
+
+#[derive(Accounts)]
+#[instruction(nonce: u64)]
+pub struct Settle<'info> {
+    #[account(has_one = bot @ CustomError::Unauthorized, seeds = [b"GLOBAL"], bump)]
+    pub global_account: Account<'info, GlobalAccount>,
+    #[account(mut, seeds = [b"USER", user.key.as_ref()], bump)]
+    pub user_account: Account<'info, UserAccount>,
+    /// CHECK:
+    #[account(mut)]
+    pub user: UncheckedAccount<'info>,
+    /// CHECK:
+    #[account(mut, constraint = treasury.key() == global_account.treasury)]
+    pub treasury: UncheckedAccount<'info>,
+    #[account(
+        mut,
+        seeds = [b"LOCK", user.key().as_ref(), nonce.to_le_bytes().as_ref()],
+        bump,
+    )]
+    pub lock_account: Account<'info, LockAccount>,
+    /// CHECK:
+    #[account(mut, seeds = [b"VAULT", user.key().as_ref()], bump)]
+    pub vault: UncheckedAccount<'info>,
+    pub bot: Signer<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/withdraw.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/withdraw.rs
new file mode 100644
index 0000000..a15e2c8
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/instructions/withdraw.rs
@@ -0,0 +1,40 @@
+use crate::{errors::CustomError, state::UserAccount};
+use anchor_lang::{prelude::*, system_program};
+
+pub fn withdraw(ctx: Context<Withdraw>, amount: u64) -> Result<()> {
+    let available_balance =
+        ctx.accounts.vault.get_lamports() - ctx.accounts.user_account.locked_amount;
+    require!(available_balance >= amount, CustomError::InsufficientFunds);
+
+    system_program::transfer(
+        CpiContext::new_with_signer(
+            ctx.accounts.system_program.to_account_info(),
+            system_program::Transfer {
+                from: ctx.accounts.vault.to_account_info(),
+                to: ctx.accounts.user.to_account_info(),
+            },
+            &[&[
+                b"VAULT",
+                ctx.accounts.user.key().as_ref(),
+                &[ctx.bumps.vault],
+            ]],
+        ),
+        amount,
+    )?;
+
+    Ok(())
+}
+
+#[derive(Accounts)]
+pub struct Withdraw<'info> {
+    #[account(mut, seeds = [b"USER", user.key.as_ref()], bump)]
+    pub user_account: Account<'info, UserAccount>,
+    #[account(mut)]
+    pub user: Signer<'info>,
+    /// CHECK:
+    #[account(mut, seeds = [b"VAULT", user.key().as_ref()], bump)]
+    pub vault: UncheckedAccount<'info>,
+    #[account(mut)]
+    pub payer: Signer<'info>,
+    pub system_program: Program<'info, System>,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/lib.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/lib.rs
new file mode 100644
index 0000000..bde08a6
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/lib.rs
@@ -0,0 +1,52 @@
+use anchor_lang::prelude::*;
+
+pub mod constants;
+pub mod errors;
+pub mod instructions;
+pub mod state;
+pub mod utils;
+
+use instructions::*;
+
+declare_id!("GguVKxU88NUe3GLtns7Uaa6a8Pjb9USKq3WD1rjZnPS9");
+
+#[program]
+pub mod balance_payment {
+    use super::*;
+
+    pub fn initialize(ctx: Context<Initialize>) -> Result<()> {
+        instructions::initialize(ctx)
+    }
+
+    pub fn set_bot(ctx: Context<SetBot>) -> Result<()> {
+        instructions::set_bot(ctx)
+    }
+
+    pub fn set_treasury(ctx: Context<SetTreasury>) -> Result<()> {
+        instructions::set_treasury(ctx)
+    }
+
+    pub fn register(ctx: Context<Register>) -> Result<()> {
+        instructions::register(ctx)
+    }
+
+    pub fn deposit(ctx: Context<Deposit>, amount: u64) -> Result<()> {
+        instructions::deposit(ctx, amount)
+    }
+
+    pub fn withdraw(ctx: Context<Withdraw>, amount: u64) -> Result<()> {
+        instructions::withdraw(ctx, amount)
+    }
+
+    pub fn lock(ctx: Context<Lock>, recover_info: ED25519RecoverInfo, amount: u64) -> Result<()> {
+        instructions::lock(ctx, recover_info, amount)
+    }
+
+    pub fn settle(ctx: Context<Settle>, _nonce: u64, amount_to_transfer: u64) -> Result<()> {
+        instructions::settle(ctx, _nonce, amount_to_transfer)
+    }
+
+    pub fn pay(ctx: Context<Pay>, recover_info: ED25519RecoverInfo, amount_to_transfer: u64) -> Result<()> {
+        instructions::pay(ctx, recover_info, amount_to_transfer)
+    }
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/global.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/global.rs
new file mode 100644
index 0000000..1fd8374
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/global.rs
@@ -0,0 +1,9 @@
+use anchor_lang::prelude::*;
+
+#[account]
+#[derive(InitSpace)]
+pub struct GlobalAccount {
+    pub authority: Pubkey,
+    pub bot: Pubkey,
+    pub treasury: Pubkey,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/lock.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/lock.rs
new file mode 100644
index 0000000..454eb33
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/lock.rs
@@ -0,0 +1,7 @@
+use anchor_lang::prelude::*;
+
+#[account]
+#[derive(InitSpace)]
+pub struct LockAccount {
+    pub amount: u64,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/mod.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/mod.rs
new file mode 100644
index 0000000..892ebc5
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/mod.rs
@@ -0,0 +1,7 @@
+pub mod global;
+pub mod user;
+pub mod lock;
+
+pub use global::*;
+pub use user::*;
+pub use lock::*;
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/user.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/user.rs
new file mode 100644
index 0000000..89cac1e
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/state/user.rs
@@ -0,0 +1,9 @@
+use anchor_lang::prelude::*;
+
+#[account]
+#[derive(InitSpace)]
+pub struct UserAccount {
+    pub nonce: u64,
+    pub locked_amount: u64,
+    pub vault: Pubkey,
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/utils/ed25519.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/utils/ed25519.rs
new file mode 100644
index 0000000..24e17c5
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/utils/ed25519.rs
@@ -0,0 +1,51 @@
+// from https://github.com/stegaBOB/solana_ed25519_verify/blob/main/src/lib.rs
+
+use anchor_lang::solana_program::pubkey::Pubkey;
+use anyhow::{bail, Context};
+use arrayref::array_ref;
+use curve25519_dalek::scalar::Scalar;
+use sha2::Digest;
+use solana_zk_token_sdk::curve25519::{
+    edwards::{multiply_edwards, subtract_edwards, validate_edwards, PodEdwardsPoint},
+    scalar::PodScalar,
+};
+
+// funny number
+const EDWARDS_BASE_POINT: PodEdwardsPoint = PodEdwardsPoint([
+    0x58, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+    0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0x66,
+]);
+
+pub fn verify_signature(
+    pubkey: &Pubkey,
+    signature: &[u8; 64],
+    message: &[u8],
+) -> anyhow::Result<bool> {
+    let a = PodEdwardsPoint(pubkey.to_bytes());
+    let r = PodEdwardsPoint(*array_ref![signature, 0, 32]);
+    if !validate_edwards(&a) {
+        bail!("Pubkey is not a valid EdwardsPoint")
+    }
+    if !validate_edwards(&r) {
+        bail!("Signature R is not a valid EdwardsPoint")
+    }
+
+    let s = array_ref![signature, 32, 32];
+    let s_scalar = Scalar::from_bytes_mod_order(*s);
+    let s_scalar = PodScalar(s_scalar.to_bytes());
+
+    let mut hasher = sha2::Sha512::new();
+    // R || A || M
+    hasher.update(r.0);
+    hasher.update(a.0);
+    hasher.update(message);
+    let hash_bytes = hasher.finalize();
+    let hash_array = array_ref![hash_bytes, 0, 64];
+    let h_scalar = Scalar::from_bytes_mod_order_wide(hash_array);
+    let h_scalar = PodScalar(h_scalar.to_bytes());
+
+    let s_b = multiply_edwards(&s_scalar, &EDWARDS_BASE_POINT).context("Failed to multiply S*B")?;
+    let h_a = multiply_edwards(&h_scalar, &a).context("Failed to multiply H*A")?;
+    let r_prime = subtract_edwards(&s_b, &h_a).context("Failed to subtract HA from SB")?;
+    Ok(r_prime == r)
+}
diff --git a/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/utils/mod.rs b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/utils/mod.rs
new file mode 100644
index 0000000..da1d6fe
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/programs/balance-payment/src/utils/mod.rs
@@ -0,0 +1,3 @@
+pub mod ed25519;
+
+pub use ed25519::*;
diff --git a/dephy-vending_machine-examples/balance-payment/scripts/cli.ts b/dephy-vending_machine-examples/balance-payment/scripts/cli.ts
new file mode 100644
index 0000000..1d27fee
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/scripts/cli.ts
@@ -0,0 +1,354 @@
+import * as anchor from "@coral-xyz/anchor";
+import * as ed from "@noble/ed25519";
+import { web3, Program, BN } from "@coral-xyz/anchor";
+import { BalancePayment } from "../target/types/balance_payment";
+import { Command } from "commander";
+import { Keypair } from "@solana/web3.js";
+import { v4 as uuidv4 } from "uuid";
+import keccak from "keccak";
+import { readFileSync } from "fs";
+import bs58 from "bs58";
+import os from "os";
+import path from "path";
+
+const SIGN_MESSAGE_PREFIX = "DePHY vending machine/Example:\n";
+
+const cli = new Command();
+
+let provider: anchor.AnchorProvider;
+const getBalancePaymentProgram = () => {
+  provider = anchor.AnchorProvider.env();
+  anchor.setProvider(provider);
+  return anchor.workspace.BalancePayment as Program<BalancePayment>;
+};
+
+type Methods = anchor.Program<BalancePayment>["methods"];
+
+const execute = async (tx: ReturnType<Methods[keyof Methods]>) => {
+  const pubkeys = await tx.pubkeys();
+  for (const [name, key] of Object.entries(pubkeys)) {
+    console.log(name, key.toBase58());
+  }
+  const signature = await tx.rpc();
+  console.log("signature", signature);
+  return { signature, pubkeys };
+};
+
+const sol = (n: number | string) => {
+  return new BN(Number(n) * web3.LAMPORTS_PER_SOL);
+};
+
+const showObj = (
+  obj: { [_: string]: web3.PublicKey | BN | any },
+  indent = 0
+) => {
+  const padding = " ".repeat(indent);
+  for (const [k, v] of Object.entries(obj)) {
+    if (BN.isBN(v)) {
+      console.log(padding, k, v.toNumber());
+    } else if (v?.toBase58) {
+      console.log(padding, k, v.toBase58());
+    } else if (v && typeof v === "object") {
+      console.log(padding, k);
+      showObj(v, indent + 2);
+    } else {
+      console.log(padding, k, v);
+    }
+  }
+};
+
+const getUserKeypair = (keypairPath?: string): Keypair => {
+  // Default path: ~/.config/solana/id.json
+  const defaultPath = path.join(os.homedir(), ".config", "solana", "id.json");
+  const resolvedPath = keypairPath || defaultPath;
+
+  try {
+    const keypairFile = readFileSync(resolvedPath, "utf-8");
+    const keypair = Keypair.fromSecretKey(Buffer.from(JSON.parse(keypairFile)));
+    return keypair;
+  } catch (error) {
+    throw new Error(
+      `Failed to load keypair from ${resolvedPath}: ${error.message}`
+    );
+  }
+};
+
+const generate64ByteUUIDPayload = (): Buffer => {
+  const uuid = uuidv4().replace(/-/g, "");
+  const uuidBuffer = Buffer.from(uuid, "hex");
+  const extendedBuffer = Buffer.concat([uuidBuffer, Buffer.alloc(48, 0)]);
+  return extendedBuffer;
+};
+
+const getNonce = async (user: web3.PublicKey): Promise<BN> => {
+  const balancePayment = getBalancePaymentProgram();
+  const userAccountPubkey = getUserAccountPubkey(user);
+  const userAccount = await balancePayment.account.userAccount.fetch(
+    userAccountPubkey
+  );
+  return userAccount.nonce;
+};
+
+const getUserAccountPubkey = (user: web3.PublicKey) => {
+  const [userAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+    [Buffer.from("USER"), user.toBuffer()],
+    anchor.workspace.BalancePayment.programId
+  );
+  return userAccountPubkey;
+};
+
+cli.name("cli");
+
+cli
+  .command("initialize")
+  .requiredOption("--authority <authority>", "Pubkey")
+  .requiredOption("--treasury <treasury>", "Pubkey")
+  .requiredOption("--bot <bot>", "Pubkey")
+  .action(async (opt) => {
+    const payfiPool = getBalancePaymentProgram();
+    const tx = payfiPool.methods.initialize().accountsPartial({
+      authority: new web3.PublicKey(opt.authority),
+      treasury: new web3.PublicKey(opt.treasury),
+      bot: new web3.PublicKey(opt.bot),
+    });
+    await execute(tx);
+  });
+
+cli
+  .command("set_treasury")
+  .requiredOption("--treasury <treasury>", "Pubkey")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const authority = provider.publicKey;
+    const tx = balancePayment.methods.setTreasury().accountsPartial({
+      authority,
+      treasury: new web3.PublicKey(opt.treasury),
+    });
+    await execute(tx);
+  });
+
+cli
+  .command("set_bot")
+  .requiredOption("--bot <bot>", "Pubkey")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const authority = provider.publicKey;
+    const tx = balancePayment.methods.setBot().accountsPartial({
+      authority,
+      bot: new web3.PublicKey(opt.bot),
+    });
+    await execute(tx);
+  });
+
+cli.command("register").action(async () => {
+  const balancePayment = getBalancePaymentProgram();
+  const user = provider.publicKey;
+  const tx = balancePayment.methods.register().accountsPartial({
+    user,
+  });
+  await execute(tx);
+});
+
+cli
+  .command("deposit")
+  .requiredOption("--amount <amount>", "Amount in SOL")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const user = provider.publicKey;
+    const amount = sol(opt.amount);
+    const tx = balancePayment.methods.deposit(amount).accountsPartial({
+      user,
+    });
+    await execute(tx);
+  });
+
+cli
+  .command("withdraw")
+  .requiredOption("--amount <amount>", "Amount in SOL")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const user = provider.publicKey;
+    const amount = sol(opt.amount);
+    const tx = balancePayment.methods.withdraw(amount).accountsPartial({
+      user,
+    });
+    await execute(tx);
+  });
+
+cli
+  .command("sign_message")
+  .requiredOption("--minutes <minutes>", "Minutes until deadline")
+  .option(
+    "--keypair <keypair>",
+    "Path to keypair file (default: ~/.config/solana/id.json)"
+  )
+  .action(async (opt) => {
+    // Get user's keypair
+    const userKeypair = getUserKeypair(opt.keypair);
+    const user = userKeypair.publicKey; // Use the public key from the provided keypair
+
+    // Log the user who is signing
+    console.log("Signing user:", user.toBase58());
+
+    // Get nonce from user account
+    const nonce = await getNonce(user);
+
+    // Convert minutes to deadline (current timestamp + minutes * 60 seconds)
+    const currentTimestamp = Math.floor(Date.now() / 1000);
+    const deadline = new BN(currentTimestamp + Number(opt.minutes) * 60);
+
+    // Generate payload
+    const payload = generate64ByteUUIDPayload();
+
+    // Create message
+    const message = Buffer.concat([
+      payload,
+      nonce.toArrayLike(Buffer, "le", 8),
+      deadline.toArrayLike(Buffer, "le", 8),
+    ]);
+
+    // Hash the message and generate digest
+    const messageHash = keccak("keccak256").update(message).digest();
+    const hashedMessageBase58 = bs58.encode(messageHash);
+    const digest =  new TextEncoder().encode(`${SIGN_MESSAGE_PREFIX}${hashedMessageBase58}`);
+
+    // Get user's private key
+    const privateKey = userKeypair.secretKey.slice(0, 32); // First 32 bytes are the private key
+
+    // Sign the message
+    const signature = await ed.signAsync(digest, privateKey);
+
+    // Create recoverInfo
+    const recoverInfo = {
+      signature: Array.from(signature),
+      payload: Array.from(payload),
+      deadline,
+    };
+
+    // Output recoverInfo as JSON
+    const jsonString = JSON.stringify(recoverInfo);
+    console.log("Recover Info (JSON):", jsonString);
+
+    const base64String = Buffer.from(jsonString).toString("base64");
+    console.log("Recover Info (Base64)", base64String);
+  });
+
+cli
+  .command("lock")
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--amount <amount>", "Amount in SOL")
+  .requiredOption("--recoverInfo <recoverInfo>", "Recover Info (Base64)")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const user = new web3.PublicKey(opt.user);
+    const amount = sol(opt.amount);
+    const recoverInfo = JSON.parse(
+      Buffer.from(opt.recoverInfo, "base64").toString()
+    );
+
+    recoverInfo.signature = Array.from(recoverInfo.signature);
+    recoverInfo.payload = Array.from(recoverInfo.payload);
+    recoverInfo.deadline = new BN(recoverInfo.deadline, "hex");
+
+    const [globalAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("GLOBAL")],
+      balancePayment.programId
+    );
+    const globalAccount = await balancePayment.account.globalAccount.fetch(
+      globalAccountPubkey
+    );
+
+    const tx = balancePayment.methods
+      .lock(recoverInfo, amount)
+      .accountsPartial({
+        user,
+        bot: globalAccount.bot,
+      });
+    await execute(tx);
+  });
+
+cli
+  .command("settle")
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--nonce <nonce>", "Nonce")
+  .requiredOption("--amountToTransfer <amountToTransfer>", "Amount in SOL")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const user = new web3.PublicKey(opt.user);
+    const nonce = new BN(opt.nonce);
+    const amountToTransfer = sol(opt.amountToTransfer);
+    const [globalAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("GLOBAL")],
+      balancePayment.programId
+    );
+    const globalAccount = await balancePayment.account.globalAccount.fetch(
+      globalAccountPubkey
+    );
+    const tx = balancePayment.methods
+      .settle(nonce, amountToTransfer)
+      .accountsPartial({
+        user,
+        treasury: globalAccount.treasury,
+        bot: globalAccount.bot,
+      });
+    await execute(tx);
+  });
+
+  cli
+  .command("pay")
+  .requiredOption("--user <user>", "User Pubkey")
+  .requiredOption("--amountToTransfer <amountToTransfer>", "Amount in SOL")
+  .requiredOption("--recoverInfo <recoverInfo>", "Recover Info (Base64)")
+  .action(async (opt) => {
+    const balancePayment = getBalancePaymentProgram();
+    const user = new web3.PublicKey(opt.user);
+    const amountToTransfer = sol(opt.amountToTransfer);
+    const recoverInfo = JSON.parse(
+      Buffer.from(opt.recoverInfo, "base64").toString()
+    );
+
+    recoverInfo.signature = Array.from(recoverInfo.signature);
+    recoverInfo.payload = Array.from(recoverInfo.payload);
+    recoverInfo.deadline = new BN(recoverInfo.deadline, "hex");
+
+    const [globalAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("GLOBAL")],
+      balancePayment.programId
+    );
+    const globalAccount = await balancePayment.account.globalAccount.fetch(
+      globalAccountPubkey
+    );
+
+    const tx = balancePayment.methods
+      .pay(recoverInfo, amountToTransfer)
+      .accountsPartial({
+        user,
+        treasury: globalAccount.treasury,
+        bot: globalAccount.bot,
+      });
+    await execute(tx);
+  });
+
+cli.command("show_global").action(async () => {
+  const balancePayment = getBalancePaymentProgram();
+  const [globalAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+    [Buffer.from("GLOBAL")],
+    balancePayment.programId
+  );
+  const globalAccount = await balancePayment.account.globalAccount.fetch(
+    globalAccountPubkey
+  );
+  showObj(globalAccount);
+});
+
+cli.command("show_users").action(async () => {
+  const balancePayment = getBalancePaymentProgram();
+  const allUsers = await balancePayment.account.userAccount.all();
+
+  allUsers.forEach((user) => {
+    showObj(user);
+    console.log("-".repeat(50));
+  });
+});
+
+cli.parse();
diff --git a/dephy-vending_machine-examples/balance-payment/tests/balance-payment.ts b/dephy-vending_machine-examples/balance-payment/tests/balance-payment.ts
new file mode 100644
index 0000000..8d9b009
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/tests/balance-payment.ts
@@ -0,0 +1,341 @@
+import * as anchor from "@coral-xyz/anchor";
+import { BN, Program, web3 } from "@coral-xyz/anchor";
+import { v4 as uuidv4 } from "uuid";
+import { BalancePayment } from "../target/types/balance_payment";
+import { assert } from "chai";
+import keccak from "keccak";
+import * as ed from "@noble/ed25519";
+import bs58 from 'bs58';
+
+const SIGN_MESSAGE_PREFIX = "DePHY vending machine/Example:\n";
+
+const sol = function (n: number) {
+  return new BN(n * web3.LAMPORTS_PER_SOL);
+};
+
+describe("balance-payment", () => {
+  anchor.setProvider(anchor.AnchorProvider.env());
+
+  const program = anchor.workspace.BalancePayment as Program<BalancePayment>;
+
+  const authority = web3.Keypair.generate();
+  const treasury = web3.Keypair.generate();
+  const bot = web3.Keypair.generate();
+
+  const user = web3.Keypair.generate();
+
+  const [globalAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+    [Buffer.from("GLOBAL")],
+    anchor.workspace.BalancePayment.programId
+  );
+
+  const getUserAccountPubkey = (user: web3.PublicKey) => {
+    const [userAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("USER"), user.toBuffer()],
+      anchor.workspace.BalancePayment.programId
+    );
+    return userAccountPubkey;
+  };
+
+  const getUserVaultPubkey = (user: web3.PublicKey) => {
+    const [vaultPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [Buffer.from("VAULT"), user.toBuffer()],
+      anchor.workspace.BalancePayment.programId
+    );
+    return vaultPubkey;
+  };
+
+  const getLockAccountPubkey = (user: web3.PublicKey, nonce: BN) => {
+    const [lockAccountPubkey, _] = web3.PublicKey.findProgramAddressSync(
+      [
+        Buffer.from("LOCK"),
+        user.toBuffer(),
+        nonce.toArrayLike(Buffer, "le", 8),
+      ],
+      program.programId
+    );
+    return lockAccountPubkey;
+  };
+
+  const generate64ByteUUIDPayload = (): Buffer => {
+    const uuid = uuidv4().replace(/-/g, ""); // 去掉连字符
+    const uuidBuffer = Buffer.from(uuid, "hex");
+
+    const extendedBuffer = Buffer.concat([uuidBuffer, Buffer.alloc(48, 0)]);
+
+    return extendedBuffer;
+  };
+  const airdrop = async (to: web3.PublicKey, amount: BN) => {
+    await anchor.Native.system()
+      .methods.transfer(amount)
+      .accounts({ to })
+      .rpc();
+  };
+
+  before(async () => {
+    await airdrop(user.publicKey, sol(100));
+  });
+
+  it("initialize", async () => {
+    const tempTreasury = web3.Keypair.generate().publicKey;
+    const tempBot = web3.Keypair.generate().publicKey;
+    const { signature } = await program.methods
+      .initialize()
+      .accountsPartial({
+        authority: authority.publicKey,
+        treasury: tempTreasury,
+        bot: tempBot,
+      })
+      .rpcAndKeys();
+    console.log("initialize:", signature);
+
+    const global = await program.account.globalAccount.fetch(
+      globalAccountPubkey
+    );
+    assert.equal(global.authority.toString(), authority.publicKey.toString());
+    assert.equal(global.treasury.toString(), tempTreasury.toString());
+    assert.equal(global.bot.toString(), tempBot.toString());
+  });
+
+  it("set treasury", async () => {
+    const { signature } = await program.methods
+      .setTreasury()
+      .accountsPartial({
+        authority: authority.publicKey,
+        treasury: treasury.publicKey,
+      })
+      .signers([authority])
+      .rpcAndKeys();
+    console.log("set_treasury:", signature);
+
+    const global = await program.account.globalAccount.fetch(
+      globalAccountPubkey
+    );
+    assert.equal(global.treasury.toString(), treasury.publicKey.toString());
+  });
+
+  it("set bot", async () => {
+    const { signature } = await program.methods
+      .setBot()
+      .accountsPartial({
+        authority: authority.publicKey,
+        bot: bot.publicKey,
+      })
+      .signers([authority])
+      .rpcAndKeys();
+    console.log("set_bot:", signature);
+
+    const global = await program.account.globalAccount.fetch(
+      globalAccountPubkey
+    );
+    assert.equal(global.bot.toString(), bot.publicKey.toString());
+  });
+
+  it("register", async () => {
+    const { signature } = await program.methods
+      .register()
+      .accountsPartial({
+        user: user.publicKey,
+      })
+      .signers([user])
+      .rpcAndKeys();
+    console.log("register:", signature);
+
+    const userAccountPubkey = getUserAccountPubkey(user.publicKey);
+    const userAccount = await program.account.userAccount.fetch(
+      userAccountPubkey
+    );
+    assert.equal(
+      userAccount.vault.toString(),
+      getUserVaultPubkey(user.publicKey).toString()
+    );
+  });
+
+  it("deposit", async () => {
+    const amount = sol(11);
+
+    const { signature } = await program.methods
+      .deposit(amount)
+      .accountsPartial({
+        user: user.publicKey,
+      })
+      .signers([user])
+      .rpcAndKeys();
+    console.log("deposit:", signature);
+
+    const userVaultPubkey = getUserVaultPubkey(user.publicKey);
+    const userVaultBalance = await program.provider.connection.getBalance(
+      userVaultPubkey
+    );
+
+    assert(amount.eq(new BN(userVaultBalance)));
+  });
+
+  it("withdraw", async () => {
+    const amount = sol(1);
+
+    const { signature } = await program.methods
+      .withdraw(amount)
+      .accountsPartial({
+        user: user.publicKey,
+      })
+      .signers([user])
+      .rpcAndKeys();
+    console.log("withdraw:", signature);
+
+    const userVaultPubkey = getUserVaultPubkey(user.publicKey);
+    const userVaultBalance = await program.provider.connection.getBalance(
+      userVaultPubkey
+    );
+
+    assert(sol(10).eq(new BN(userVaultBalance)));
+  });
+
+  it("lock", async () => {
+    const amount = sol(10);
+
+    const userAccountPubkey = getUserAccountPubkey(user.publicKey);
+
+    let userAccount = await program.account.userAccount.fetch(
+      userAccountPubkey
+    );
+
+    const nonce = userAccount.nonce;
+    const payload = generate64ByteUUIDPayload();
+
+    const deadline = new BN(Date.now() / 1000 + 60 * 30); // 30 minutes later
+    const message = Buffer.concat([
+      payload,
+      nonce.toArrayLike(Buffer, "le", 8),
+      deadline.toArrayLike(Buffer, "le", 8),
+    ]);
+
+    const messageHash = keccak("keccak256").update(message).digest();
+    const hashedMessageBase58 = bs58.encode(messageHash);
+    const digest =  new TextEncoder().encode(`${SIGN_MESSAGE_PREFIX}${hashedMessageBase58}`);
+
+    const privateKey = user.secretKey.slice(0, 32);
+
+    const signature = await ed.signAsync(digest, privateKey);
+
+    const recoverInfo = {
+      signature: Array.from(signature),
+      payload: Array.from(payload),
+      deadline,
+    };
+
+    const { signature: txSignature } = await program.methods
+    .lock(recoverInfo, amount)
+    .accountsPartial({
+      user: user.publicKey,
+      bot: bot.publicKey,
+    })
+    .signers([bot])
+    .rpcAndKeys();
+
+    console.log("lock:", txSignature);
+
+    const lockAccountPubkey = getLockAccountPubkey(user.publicKey, nonce);
+    const lockAccount = await program.account.lockAccount.fetch(
+      lockAccountPubkey
+    );
+    assert.equal(lockAccount.amount.toString(), amount.toString());
+
+    userAccount = await program.account.userAccount.fetch(userAccountPubkey);
+    assert(userAccount.lockedAmount.eq(amount));
+  });
+
+  it("settle", async () => {
+    const nonce = new BN(0);
+    const amountToTransfer = sol(5);
+
+    const { signature } = await program.methods
+      .settle(nonce, amountToTransfer)
+      .accountsPartial({
+        user: user.publicKey,
+        treasury: treasury.publicKey,
+        bot: bot.publicKey,
+      })
+      .signers([bot])
+      .rpcAndKeys();
+
+    console.log("settle:", signature);
+
+    const treasuryBalance = await program.provider.connection.getBalance(
+      treasury.publicKey
+    );
+    assert.equal(treasuryBalance, amountToTransfer.toNumber());
+
+    const lockAccountPubkey = getLockAccountPubkey(user.publicKey, nonce);
+
+    try {
+      await program.account.lockAccount.fetch(
+        lockAccountPubkey
+      );
+    } catch (error) {
+      assert(error.message.includes("Account does not exist"))
+    }
+
+    const userAccountPubkey = getUserAccountPubkey(user.publicKey);
+    const userAccount = await program.account.userAccount.fetch(
+      userAccountPubkey
+    );
+    assert(userAccount.lockedAmount.eq(new BN(0)));
+  });
+
+  it("pay", async () => {
+    const amountToTransfer = sol(1);
+
+    const userAccountPubkey = getUserAccountPubkey(user.publicKey);
+
+    let userAccount = await program.account.userAccount.fetch(
+      userAccountPubkey
+    );
+
+    const nonce = userAccount.nonce;
+    const payload = generate64ByteUUIDPayload();
+
+    const deadline = new BN(Date.now() / 1000 + 60 * 30); // 30 minutes later
+    const message = Buffer.concat([
+      payload,
+      nonce.toArrayLike(Buffer, "le", 8),
+      deadline.toArrayLike(Buffer, "le", 8),
+    ]);
+
+    const messageHash = keccak("keccak256").update(message).digest();
+    const hashedMessageBase58 = bs58.encode(messageHash);
+    const digest =  new TextEncoder().encode(`${SIGN_MESSAGE_PREFIX}${hashedMessageBase58}`);
+
+    const privateKey = user.secretKey.slice(0, 32);
+
+    const signature = await ed.signAsync(digest, privateKey);
+
+    const recoverInfo = {
+      signature: Array.from(signature),
+      payload: Array.from(payload),
+      deadline,
+    };
+
+    const vaultBalanceBefore = await program.provider.connection.getBalance(
+      userAccount.vault
+    );
+
+    const { signature: txSignature } = await program.methods
+    .pay(recoverInfo, amountToTransfer)
+    .accountsPartial({
+      user: user.publicKey,
+      treasury: treasury.publicKey,
+      bot: bot.publicKey,
+    })
+    .signers([bot])
+    .rpcAndKeys();
+
+    console.log("pay:", txSignature);
+
+    const vaultBalanceAfter = await program.provider.connection.getBalance(
+      userAccount.vault
+    );
+
+    assert.equal(vaultBalanceBefore - vaultBalanceAfter, amountToTransfer.toNumber());
+  });
+});
diff --git a/dephy-vending_machine-examples/balance-payment/tsconfig.json b/dephy-vending_machine-examples/balance-payment/tsconfig.json
new file mode 100644
index 0000000..247d160
--- /dev/null
+++ b/dephy-vending_machine-examples/balance-payment/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "types": ["mocha", "chai"],
+    "typeRoots": ["./node_modules/@types"],
+    "lib": ["es2015"],
+    "module": "commonjs",
+    "target": "es6",
+    "esModuleInterop": true,
+    "resolveJsonModule": true
+  }
+}
diff --git a/dephy-vending_machine-examples/cliff.toml b/dephy-vending_machine-examples/cliff.toml
new file mode 100644
index 0000000..cfd438c
--- /dev/null
+++ b/dephy-vending_machine-examples/cliff.toml
@@ -0,0 +1,95 @@
+# git-cliff ~ configuration file
+# https://git-cliff.org/docs/configuration
+
+[changelog]
+# changelog header
+header = """
+# Changelog\n
+All notable changes to this project will be documented in this file. See [conventional commits](https://www.conventionalcommits.org/) for commit guidelines.\n
+"""
+# template for the changelog body
+# https://keats.github.io/tera/docs/#introduction
+body = """
+---
+{% if version %}\
+    {% if previous.version %}\
+        ## [{{ version | trim_start_matches(pat="v") }}]($REPO/compare/{{ previous.version }}..{{ version }}) - {{ timestamp | date(format="%Y-%m-%d") }}
+    {% else %}\
+        ## [{{ version | trim_start_matches(pat="v") }}] - {{ timestamp | date(format="%Y-%m-%d") }}
+    {% endif %}\
+{% else %}\
+    ## [unreleased]
+{% endif %}\
+{% for group, commits in commits | group_by(attribute="group") %}
+    ### {{ group | striptags | trim | upper_first }}
+    {% for commit in commits
+    | filter(attribute="scope")
+    | sort(attribute="scope") %}
+        - **({{commit.scope}})**{% if commit.breaking %} [**breaking**]{% endif %} \
+            {{ commit.message|trim }} - ([{{ commit.id | truncate(length=7, end="") }}]($REPO/commit/{{ commit.id }})) - {{ commit.author.name }}
+    {%- endfor -%}
+    {% raw %}\n{% endraw %}\
+    {%- for commit in commits %}
+        {%- if commit.scope -%}
+        {% else -%}
+            - {% if commit.breaking %} [**breaking**]{% endif %}\
+                {{ commit.message|trim }} - ([{{ commit.id | truncate(length=7, end="") }}]($REPO/commit/{{ commit.id }})) - {{ commit.author.name }}
+        {% endif -%}
+    {% endfor -%}
+{% endfor %}\n
+"""
+# template for the changelog footer
+footer = """
+<!-- generated by git-cliff -->
+"""
+# remove the leading and trailing whitespace from the templates
+trim = true
+# postprocessors
+postprocessors = [
+    { pattern = '\$REPO', replace = "https://github.com/dephy-io/dephy-vending_machine-examples" }, # replace repository URL
+]
+
+[git]
+# parse the commits based on https://www.conventionalcommits.org
+conventional_commits = true
+# filter out the commits that are not conventional
+filter_unconventional = false
+# process each line of a commit as an individual commit
+split_commits = false
+# regex for preprocessing the commit messages
+commit_preprocessors = [
+    # { pattern = '\((\w+\s)?#([0-9]+)\)', replace = "([#${2}](https://github.com/orhun/git-cliff/issues/${2}))"}, # replace issue numbers
+]
+# regex for parsing and grouping commits
+commit_parsers = [
+    { message = "\\[skip", skip = true },
+    { message = "\\p{Han}", skip = true },
+    { message = "^feat", group = "Features" },
+    { message = "^fix", group = "Bug Fixes" },
+    { message = "^doc", group = "Documentation" },
+    { message = "^perf", group = "Performance" },
+    { message = "^refactor", group = "Refactoring" },
+    { message = "^style", group = "Style" },
+    { message = "^revert", group = "Revert" },
+    { message = "^test", group = "Tests" },
+    { message = "^chore\\(version\\):", skip = true },
+    { message = "^chore", group = "Miscellaneous Chores" },
+    { message = ".*", group = "Other" },
+    { body = ".*security", group = "Security" },
+]
+# protect breaking changes from being skipped due to matching a skipping commit_parser
+protect_breaking_commits = false
+# filter out the commits that are not matched by commit parsers
+filter_commits = false
+# regex for matching git tags
+tag_pattern = "v[0-9].*"
+# regex for skipping tags
+skip_tags = "v0.1.0-beta.1"
+# regex for ignoring tags
+ignore_tags = ""
+# sort the tags topologically
+topo_order = false
+# sort the commits inside sections by oldest/newest order
+sort_commits = "oldest"
+# limit the number of commits included in the changelog.
+# limit_commits = 42
diff --git a/dephy-vending_machine-examples/deny.toml b/dephy-vending_machine-examples/deny.toml
new file mode 100644
index 0000000..36e879a
--- /dev/null
+++ b/dephy-vending_machine-examples/deny.toml
@@ -0,0 +1,58 @@
+[advisories]
+version = 2
+yanked = "warn"
+db-path = "~/.cargo/advisory-db"
+db-urls = ["https://github.com/rustsec/advisory-db"]
+ignore = [
+  # waiting for nostr crates to be updated
+  "RUSTSEC-2024-0384",
+  # waiting for solana crates to be updated
+  "RUSTSEC-2022-0093",
+  # waiting for solana crates to be updated
+  "RUSTSEC-2024-0388",
+  # waiting for solana crates to be updated
+  "RUSTSEC-2024-0344",
+  # waiting for solana crates to be updated
+  "RUSTSEC-2021-0145",
+  # waiting for solana crates to be updated
+  "RUSTSEC-2024-0375",
+]
+
+[bans]
+multiple-versions = "warn"
+wildcards = "deny"
+highlight = "all"
+
+[licenses]
+version = 2
+confidence-threshold = 0.8
+
+allow = [
+    "MIT",
+    "MITNFA",
+    "Apache-2.0",
+    "Apache-2.0 WITH LLVM-exception",
+    "BSD-3-Clause",
+    "BSD-2-Clause",
+    "0BSD",
+    "ISC",
+    "Unicode-3.0",
+    "Unicode-DFS-2016",
+    "Unlicense",
+    "MPL-2.0",
+    "CC0-1.0",
+    "Zlib",
+    # https://github.com/briansmith/ring/issues/902
+    "LicenseRef-ring",
+]
+
+[[licenses.clarify]]
+name = "ring"
+expression = "LicenseRef-ring"
+license-files = [{ path = "LICENSE", hash = 0xbd0eed23 }]
+
+[sources]
+unknown-registry = "deny"
+unknown-git = "deny"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+allow-git = ["git://github.com/anza-xyz/agave.git"]
diff --git a/dephy-vending_machine-examples/doc/architecture.png b/dephy-vending_machine-examples/doc/architecture.png
new file mode 100644
index 0000000..f102438
Binary files /dev/null and b/dephy-vending_machine-examples/doc/architecture.png differ
diff --git a/dephy-vending_machine-examples/docker-compose-postgres-init/decharge-controller-docker-entrypoint-initdb.d/migrate.sh b/dephy-vending_machine-examples/docker-compose-postgres-init/decharge-controller-docker-entrypoint-initdb.d/migrate.sh
new file mode 100755
index 0000000..d33b873
--- /dev/null
+++ b/dephy-vending_machine-examples/docker-compose-postgres-init/decharge-controller-docker-entrypoint-initdb.d/migrate.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+
+export PGPASSWORD="dephy"
+
+psql -U dephy -c "CREATE DATABASE dephy_messaging_network;"
+psql -U dephy -c "CREATE DATABASE dephy_decharge_controller_server;"
+
+for sql_file in /messaging_network_migrations/*.sql; do
+  echo "Executing $sql_file..."
+  psql -U dephy -d dephy_messaging_network -f "$sql_file"
+done
+
+for sql_file in /decharge_controller_server_migrations/*.sql; do
+  echo "Executing $sql_file..."
+  psql -U dephy -d dephy_decharge_controller_server -f "$sql_file"
+done
diff --git a/dephy-vending_machine-examples/docker-compose-postgres-init/messaging_network_migrations/20241125030333_initial.sql b/dephy-vending_machine-examples/docker-compose-postgres-init/messaging_network_migrations/20241125030333_initial.sql
new file mode 100644
index 0000000..b2acaca
--- /dev/null
+++ b/dephy-vending_machine-examples/docker-compose-postgres-init/messaging_network_migrations/20241125030333_initial.sql
@@ -0,0 +1,16 @@
+CREATE TABLE IF NOT EXISTS events (
+    id bigserial PRIMARY KEY,
+    event_id character varying NOT NULL,
+    prev_event_id character varying NOT NULL,
+    pubkey character varying NOT NULL,
+    created_at bigint NOT NULL,
+    original character varying NOT NULL,
+    "session" character varying NOT NULL,
+    mention character varying,
+
+    CONSTRAINT events_unique_event_id
+    UNIQUE (event_id),
+
+    CONSTRAINT events_unique_pubkey_session_prev_event_id
+    UNIQUE (pubkey, session, prev_event_id)
+);
diff --git a/dephy-vending_machine-examples/docker-compose.yml b/dephy-vending_machine-examples/docker-compose.yml
new file mode 100644
index 0000000..1660dfa
--- /dev/null
+++ b/dephy-vending_machine-examples/docker-compose.yml
@@ -0,0 +1,85 @@
+services:
+  postgres:
+    image: postgres:16
+    restart: always
+    environment:
+      POSTGRES_USER: dephy
+      POSTGRES_PASSWORD: dephy
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./docker-compose-postgres-init/messaging_network_migrations:/messaging_network_migrations
+      - ./docker-compose-postgres-init/decharge-controller-docker-entrypoint-initdb.d:/docker-entrypoint-initdb.d
+      - ./examples/decharge-controller/migrations:/decharge_controller_server_migrations
+    ports:
+      - "6432:5432"
+
+  dephy-messaging-network:
+    depends_on:
+      - postgres
+    image: dephyio/dephy-messaging-network:master
+    restart: always
+    environment:
+      RUST_LOG: "info,dephy_messaging_network=debug"
+      RUST_BACKTRACE: "1"
+    command: "serve --pg-url 'postgresql://dephy:dephy@postgres:5432/dephy_messaging_network' --api-addr 0.0.0.0:8000"
+    ports:
+      - "8000:8000"
+
+  dephy-decharge-controller-server:
+    depends_on:
+      - dephy-messaging-network
+    image: dephyio/dephy-vending-machine-examples:main
+    restart: always
+    entrypoint: /usr/bin/dephy-decharge-controller-server
+    environment:
+      RUST_LOG: "debug"
+      RUST_BACKTRACE: "1"
+    volumes:
+      - ./keypairs/bot.demo.json:/opt/dephy-vending-machine-examples/data/solana-keypair
+    command: >
+      --nostr-relay 'ws://dephy-messaging-network:8000'
+      --key '80ed9975bc5c18c8852c202e4ddc0ae62abf7d9484c3a0d425f501623907129b'
+      --solana-rpc-url "${SOLANA_RPC_URL:-http://host.docker.internal:8899}"
+      --pg-url 'postgresql://dephy:dephy@postgres:5432/dephy_decharge_controller_server'
+
+  dephy-decharge-controller-node-1:
+    depends_on:
+      - dephy-messaging-network
+    image: dephyio/dephy-vending-machine-examples:main
+    restart: always
+    entrypoint: /usr/bin/dephy-decharge-controller-node
+    user: root # have to be root to write key file to data directory
+    environment:
+      RUST_LOG: "debug"
+      RUST_BACKTRACE: "1"
+    volumes:
+      - dephy_decharge_controller_node_1_data:/opt/dephy-vending-machine-examples/data:rw
+    command: >
+      --nostr-relay 'ws://dephy-messaging-network:8000'
+      --solana-rpc-url "${SOLANA_RPC_URL:-http://host.docker.internal:8899}"
+      --machine-pubkeys 'd041ea9854f2117b82452457c4e6d6593a96524027cd4032d2f40046deb78d93'
+      --admin-pubkey '90b6bb6472b2609c63dfb588aa1a10780dc043ffc0ab2349679c50644c0bc445'
+
+  dephy-gacha-controller:
+    depends_on:
+      - dephy-messaging-network
+    image: dephyio/dephy-vending-machine-examples:main
+    restart: always
+    entrypoint: /usr/bin/dephy-gacha-controller
+    user: root # have to be root to write key file to data directory
+    environment:
+      RUST_LOG: "debug"
+      RUST_BACKTRACE: "1"
+    volumes:
+      - dephy_gacha_controller_data:/opt/dephy-vending-machine-examples/data:rw
+      - ./keypairs/bot.demo.json:/opt/dephy-vending-machine-examples/data/solana-keypair
+    command: >
+      --nostr-relay 'ws://dephy-messaging-network:8000'
+      --solana-rpc-url "${SOLANA_RPC_URL:-http://host.docker.internal:8899}"
+      --machine-pubkeys 'd041ea9854f2117b82452457c4e6d6593a96524027cd4032d2f40046deb78d93'
+      --admin-pubkey 'd041ea9854f2117b82452457c4e6d6593a96524027cd4032d2f40046deb78d93'
+
+volumes:
+  postgres_data:
+  dephy_decharge_controller_node_1_data:
+  dephy_gacha_controller_data:
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/Cargo.toml b/dephy-vending_machine-examples/examples/decharge-controller/Cargo.toml
new file mode 100644
index 0000000..7e0bbab
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "dephy-decharge-controller"
+version = "0.1.0"
+edition = "2021"
+license.workspace = true
+
+[dependencies]
+clap = { workspace = true }
+dephy-balance-payment-sdk = { workspace = true }
+futures = { workspace = true }
+nostr = { workspace = true }
+nostr-sdk = { workspace = true }
+sea-query = "0.32.1"
+sea-query-binder = { version = "0.7.0", features = ["runtime-tokio", "sqlx-postgres"] }
+serde = { workspace = true }
+serde_json = { workspace = true }
+sqlx = { version = "0.8.3", features = ["postgres", "runtime-tokio"] }
+thiserror = { workspace = true }
+tokio = { workspace = true, features = ["process", "rt-multi-thread"] }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true, features = ["env-filter"] }
+
+[[bin]]
+name = "dephy-decharge-controller-node"
+path = "bin/dephy-decharge-controller-node.rs"
+
+[[bin]]
+name = "dephy-decharge-controller-server"
+path = "bin/dephy-decharge-controller-server.rs"
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/README.md b/dephy-vending_machine-examples/examples/decharge-controller/README.md
new file mode 100644
index 0000000..a153c50
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/README.md
@@ -0,0 +1,84 @@
+# dephy-decharge-controller
+
+## Run by Docker Compose
+
+```bash
+docker compose up
+```
+
+## Run manually
+
+### Prepare
+
+In this example, you should have a messaging network running on `ws://127.0.0.1:8000`.
+You can modify `--nostr-relay` if it is running on a different address.
+
+To run a messaging network you need a postgresql database with schema:
+
+```sql
+CREATE TABLE IF NOT EXISTS events (
+    id bigserial PRIMARY KEY,
+    event_id character varying NOT NULL,
+    prev_event_id character varying NOT NULL,
+    pubkey character varying NOT NULL,
+    created_at bigint NOT NULL,
+    original character varying NOT NULL,
+    "session" character varying NOT NULL,
+    mention character varying,
+
+    CONSTRAINT events_unique_event_id
+    UNIQUE (event_id),
+
+    CONSTRAINT events_unique_pubkey_session_prev_event_id
+    UNIQUE (pubkey, session, prev_event_id)
+);
+```
+
+To run a messaging network by docker:
+
+```shell
+docker run --name dephy-messaging-network --restart=always --network="host" -d dephyio/dephy-messaging-network:master serve --pg-url 'postgresql://<username>:<password>@<address>/<db>'
+```
+
+### Run Server
+
+The schema of the database is in [migrations](./migrations/).
+
+You can migrate it by [sqlx-cli](https://crates.io/crates/sqlx-cli) or enable those sql manually. To migrate it by sqlx-cli:
+
+```shell
+sqlx database create --database-url postgresql://<username:<password>>@<address>/<db>
+sqlx migrate run --database-url postgresql://<username>:<password>@<address>/<db>
+```
+
+The server need your solana keypair.
+
+```shell
+mkdir data
+# copy your keypair to data/solana-keypair
+```
+
+To run the server:
+
+```shell
+cargo run --bin dephy-decharge-controller-server -- --nostr-relay ws://127.0.0.1:8000 --key <key> --pg-url postgresql://<username>:<password>@<address>/<db>
+```
+
+### Run Node (this is on charger equipment side)
+
+The node need your solana keypair.
+
+```shell
+mkdir data
+# copy your keypair to data/solana-keypair
+```
+
+```shell
+cargo run --bin dephy-decharge-controller-node -- --nostr-relay ws://127.0.0.1:8000 --machine-pubkeys d041ea9854f2117b82452457c4e6d6593a96524027cd4032d2f40046deb78d93 --admin-pubkey <pubkey of server>
+```
+
+### Cli Example (it simulates a charging process)
+
+```shell
+cargo run --example cli -- --nostr-relay ws://127.0.0.1:8000 --machine-pubkey d041ea9854f2117b82452457c4e6d6593a96524027cd4032d2f40046deb78d93 --user <user solana address> --nonce <nonce of recover info> --recover-info <recover info>
+```
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/bin/dephy-decharge-controller-node.rs b/dephy-vending_machine-examples/examples/decharge-controller/bin/dephy-decharge-controller-node.rs
new file mode 100644
index 0000000..9152019
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/bin/dephy-decharge-controller-node.rs
@@ -0,0 +1,128 @@
+use std::path::PathBuf;
+
+use clap::value_parser;
+use clap::Arg;
+use clap::ArgAction;
+use clap::ArgMatches;
+use clap::Command;
+use nostr::Keys;
+
+const SESSION: &str = "dephy-decharge-controller";
+
+fn parse_args() -> Command {
+    Command::new("dephy-decharge-controller-node")
+        .arg_required_else_help(true)
+        .about("Dephy decharge controller node daemon")
+        .version(dephy_decharge_controller::VERSION)
+        .arg(
+            Arg::new("NOSTR_RELAY")
+                .long("nostr-relay")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Nostr relay address"),
+        )
+        .arg(
+            Arg::new("KEY_FILE")
+                .long("key-file")
+                .num_args(1)
+                .default_value("data/key")
+                .value_parser(value_parser!(PathBuf))
+                .action(ArgAction::Set)
+                .help("Path to the file containing the hex or bech32 secret key"),
+        )
+        .arg(
+            Arg::new("ADMIN_PUBKEY")
+                .long("admin-pubkey")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Admin public key"),
+        )
+        .arg(
+            Arg::new("MACHINE_PUBKEYS")
+                .long("machine-pubkeys")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Machine public keys, comma separated"),
+        )
+        .arg(
+            Arg::new("SOLANA_RPC_URL")
+                .long("solana-rpc-url")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Solana RPC URL"),
+        )
+}
+
+async fn controller(args: &ArgMatches) {
+    let nostr_relay = args.get_one::<String>("NOSTR_RELAY").unwrap();
+    let key_file_path = args.get_one::<PathBuf>("KEY_FILE").unwrap();
+    let keys = read_or_generate_keypair(key_file_path);
+    let admin_pubkey = args
+        .get_one::<String>("ADMIN_PUBKEY")
+        .unwrap()
+        .parse()
+        .expect("Invalid admin pubkey");
+    let machine_pubkeys = args
+        .get_one::<String>("MACHINE_PUBKEYS")
+        .unwrap()
+        .split(',')
+        .map(|s| s.parse().expect("Invalid machine pubkey"))
+        .collect();
+    let solana_rpc_url = args.get_one::<String>("SOLANA_RPC_URL").unwrap();
+
+    println!("nostr relay: {}", nostr_relay);
+    println!("pubkey: {}", keys.public_key());
+
+    let client = dephy_decharge_controller::RelayClient::new(nostr_relay, &keys, SESSION, 4096)
+        .await
+        .expect("Failed to connect to relay");
+
+    let message_handler = dephy_decharge_controller::node::MessageHandler::new(
+        client,
+        keys.public_key(),
+        admin_pubkey,
+        machine_pubkeys,
+        solana_rpc_url,
+    );
+
+    message_handler.run().await
+}
+
+fn read_or_generate_keypair(path: &PathBuf) -> Keys {
+    let keys = std::fs::read_to_string(path)
+        .map(|content| content.trim().parse().expect("Invalid key"))
+        .unwrap_or_else(|_| {
+            tracing::info!(
+                "Key file not found, generating a new one at: {}",
+                path.display()
+            );
+            let keys = Keys::generate();
+            std::fs::write(path, keys.secret_key().to_secret_hex())
+                .unwrap_or_else(|e| panic!("Failed to write key {}: {e:?}", path.display()));
+            keys
+        });
+
+    let pubkey_path = path.with_extension("pub");
+    std::fs::write(&pubkey_path, keys.public_key().to_hex()).unwrap_or_else(|e| {
+        panic!(
+            "Failed to write public key {}: {e:?}",
+            pubkey_path.display()
+        )
+    });
+
+    keys
+}
+
+#[tokio::main]
+async fn main() {
+    let _ = tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .try_init();
+
+    let cmd = parse_args();
+    controller(&cmd.get_matches()).await;
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/bin/dephy-decharge-controller-server.rs b/dephy-vending_machine-examples/examples/decharge-controller/bin/dephy-decharge-controller-server.rs
new file mode 100644
index 0000000..6f82760
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/bin/dephy-decharge-controller-server.rs
@@ -0,0 +1,110 @@
+use std::path::PathBuf;
+
+use clap::value_parser;
+use clap::Arg;
+use clap::ArgAction;
+use clap::ArgMatches;
+use clap::Command;
+use nostr::Keys;
+
+const SESSION: &str = "dephy-decharge-controller";
+
+fn parse_args() -> Command {
+    Command::new("dephy-decharge-controller-server")
+        .arg_required_else_help(true)
+        .about("Dephy decharge controller server")
+        .version(dephy_decharge_controller::VERSION)
+        .arg(
+            Arg::new("NOSTR_RELAY")
+                .long("nostr-relay")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Nostr relay address"),
+        )
+        .arg(
+            Arg::new("KEY")
+                .long("key")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Hex or bech32 secret key"),
+        )
+        .arg(
+            Arg::new("PG_URL")
+                .long("pg-url")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Will use this address to connect to postgres"),
+        )
+        .arg(
+            Arg::new("SOLANA_RPC_URL")
+                .long("solana-rpc-url")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Solana RPC URL"),
+        )
+        .arg(
+            Arg::new("SOLANA_KEYPAIR")
+                .long("solana-keypair")
+                .num_args(1)
+                .default_value("data/solana-keypair")
+                .value_parser(value_parser!(PathBuf))
+                .action(ArgAction::Set)
+                .help("Solana keypair path"),
+        )
+}
+
+async fn controller(args: &ArgMatches) {
+    let nostr_relay = args.get_one::<String>("NOSTR_RELAY").unwrap();
+    let keys: Keys = args
+        .get_one::<String>("KEY")
+        .unwrap()
+        .parse()
+        .expect("Invalid key");
+    let pg_url = args.get_one::<String>("PG_URL").unwrap();
+    let solana_rpc_url = args.get_one::<String>("SOLANA_RPC_URL").unwrap();
+    let solana_keypair_path = args.get_one::<PathBuf>("SOLANA_KEYPAIR").unwrap();
+    if !solana_keypair_path.exists() {
+        panic!(
+            "Solana keypair file not found: {}",
+            solana_keypair_path.display()
+        );
+    }
+
+    println!("nostr relay: {}", nostr_relay);
+    println!("pubkey: {}", keys.public_key());
+
+    let client = dephy_decharge_controller::RelayClient::new(nostr_relay, &keys, SESSION, 4096)
+        .await
+        .expect("Failed to connect to relay");
+
+    let db = sqlx::PgPool::connect(pg_url)
+        .await
+        .expect("Failed to connect to database");
+    let state = dephy_decharge_controller::server::State::new(db);
+
+    let message_handler = dephy_decharge_controller::server::MessageHandler::new(
+        client,
+        state,
+        solana_rpc_url,
+        solana_keypair_path
+            .to_str()
+            .expect("Invalid solana keypair path"),
+        None,
+    );
+
+    message_handler.run().await
+}
+
+#[tokio::main]
+async fn main() {
+    let _ = tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .try_init();
+
+    let cmd = parse_args();
+    controller(&cmd.get_matches()).await;
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/examples/cli.rs b/dephy-vending_machine-examples/examples/decharge-controller/examples/cli.rs
new file mode 100644
index 0000000..a251027
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/examples/cli.rs
@@ -0,0 +1,158 @@
+use std::path::PathBuf;
+
+use clap::value_parser;
+use clap::Arg;
+use clap::ArgAction;
+use clap::ArgMatches;
+use clap::Command;
+use dephy_decharge_controller::message::DephyDechargeMessage;
+use dephy_decharge_controller::message::DephyDechargeMessageRequestPayload;
+use dephy_decharge_controller::message::DephyDechargeStatus;
+use dephy_decharge_controller::message::DephyDechargeStatusReason;
+use nostr::Keys;
+use nostr::Timestamp;
+use nostr_sdk::EventId;
+
+const SESSION: &str = "dephy-decharge-controller";
+
+fn parse_args() -> Command {
+    Command::new("dephy-decharge-controller-cli")
+        .arg_required_else_help(true)
+        .about("Dephy decharge controller")
+        .version(dephy_decharge_controller::VERSION)
+        .arg(
+            Arg::new("NOSTR_RELAY")
+                .long("nostr-relay")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Nostr relay address"),
+        )
+        .arg(
+            Arg::new("KEY_FILE")
+                .long("key-file")
+                .num_args(1)
+                .default_value("data/key")
+                .value_parser(value_parser!(PathBuf))
+                .action(ArgAction::Set)
+                .help("Path to the file containing the hex or bech32 secret key"),
+        )
+        .arg(
+            Arg::new("MACHINE_PUBKEY")
+                .long("machine-pubkey")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Machine public keys, comma separated"),
+        )
+        .arg(
+            Arg::new("user")
+                .long("user")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("User public key"),
+        )
+        .arg(
+            Arg::new("nonce")
+                .long("nonce")
+                .num_args(1)
+                .required(true)
+                .value_parser(value_parser!(u64))
+                .action(ArgAction::Set)
+                .help("Nonce"),
+        )
+        .arg(
+            Arg::new("recover_info")
+                .long("recover-info")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Recover info"),
+        )
+}
+
+async fn cli(args: &ArgMatches) {
+    let nostr_relay = args.get_one::<String>("NOSTR_RELAY").unwrap();
+    let key_file_path = args.get_one::<PathBuf>("KEY_FILE").unwrap();
+    let keys = read_or_generate_keypair(key_file_path);
+    let machine_pubkey = args
+        .get_one::<String>("MACHINE_PUBKEY")
+        .unwrap()
+        .parse()
+        .expect("Invalid machine pubkey");
+    let user = args.get_one::<String>("user").unwrap();
+    let nonce = args.get_one::<u64>("nonce").unwrap();
+    let recover_info = args.get_one::<String>("recover_info").unwrap();
+
+    let client = dephy_decharge_controller::RelayClient::new(nostr_relay, &keys, SESSION, 4096)
+        .await
+        .expect("Failed to connect to relay");
+
+    let mut notifications = client.notifications();
+    client
+        .subscribe(Timestamp::now(), [machine_pubkey])
+        .await
+        .expect("Failed to subscribe");
+
+    let handler = tokio::spawn(async move {
+        loop {
+            let notification = notifications.recv().await;
+            tracing::info!("Received notification: {:?}", notification);
+        }
+    });
+
+    let payload = serde_json::to_string(&DephyDechargeMessageRequestPayload {
+        user: user.clone(),
+        nonce: *nonce,
+        recover_info: recover_info.clone(),
+    })
+    .expect("Failed to serialize payload");
+
+    client
+        .send_event(&machine_pubkey.to_hex(), &DephyDechargeMessage::Request {
+            to_status: DephyDechargeStatus::Working,
+            reason: DephyDechargeStatusReason::UserRequest,
+            initial_request: EventId::all_zeros(),
+            payload,
+        })
+        .await
+        .expect("Failed to send event");
+
+    handler.await.expect("Notification handler failed");
+}
+
+fn read_or_generate_keypair(path: &PathBuf) -> Keys {
+    let keys = std::fs::read_to_string(path)
+        .map(|content| content.trim().parse().expect("Invalid key"))
+        .unwrap_or_else(|_| {
+            tracing::info!(
+                "Key file not found, generating a new one at: {}",
+                path.display()
+            );
+            let keys = Keys::generate();
+            std::fs::write(path, keys.secret_key().to_secret_hex())
+                .unwrap_or_else(|e| panic!("Failed to write key {}: {e:?}", path.display()));
+            keys
+        });
+
+    let pubkey_path = path.with_extension("pub");
+    std::fs::write(&pubkey_path, keys.public_key().to_hex()).unwrap_or_else(|e| {
+        panic!(
+            "Failed to write public key {}: {e:?}",
+            pubkey_path.display()
+        )
+    });
+
+    keys
+}
+
+#[tokio::main]
+async fn main() {
+    let _ = tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .try_init();
+
+    let cmd = parse_args();
+    cli(&cmd.get_matches()).await;
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/migrations/20250116011256_initial.sql b/dephy-vending_machine-examples/examples/decharge-controller/migrations/20250116011256_initial.sql
new file mode 100644
index 0000000..ef2a043
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/migrations/20250116011256_initial.sql
@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS received_events (
+    id bigserial PRIMARY KEY,
+    event_id character varying NOT NULL,
+    created_at bigint NOT NULL,
+    is_processed boolean NOT NULL
+);
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/lib.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/lib.rs
new file mode 100644
index 0000000..2da85c3
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/lib.rs
@@ -0,0 +1,9 @@
+pub mod message;
+pub mod node;
+mod relay_client;
+pub mod server;
+
+/// dephy-decharge-controller version
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+
+pub use relay_client::RelayClient;
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/message.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/message.rs
new file mode 100644
index 0000000..5548275
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/message.rs
@@ -0,0 +1,50 @@
+use nostr::EventId;
+use serde::Deserialize;
+use serde::Serialize;
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[repr(u8)]
+pub enum DephyDechargeStatus {
+    Available = 1,
+    Working = 2,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[repr(u8)]
+pub enum DephyDechargeStatusReason {
+    UserRequest = 1,
+    AdminRequest = 2,
+    UserBehaviour = 3,
+    LockFailed = 5,
+    Reset = 4,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum DephyDechargeMessage {
+    Request {
+        to_status: DephyDechargeStatus,
+        reason: DephyDechargeStatusReason,
+        initial_request: EventId,
+        payload: String,
+    },
+    Status {
+        status: DephyDechargeStatus,
+        reason: DephyDechargeStatusReason,
+        initial_request: EventId,
+        payload: String,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DephyDechargeMessageRequestPayload {
+    pub user: String,
+    pub nonce: u64,
+    pub recover_info: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DephyDechargeMessageStatusPayload {
+    pub user: String,
+    pub nonce: u64,
+    pub recover_info: String,
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/node/message_handler.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/node/message_handler.rs
new file mode 100644
index 0000000..db134f6
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/node/message_handler.rs
@@ -0,0 +1,390 @@
+use std::collections::HashMap;
+use std::collections::HashSet;
+
+use nostr::Event;
+use nostr::EventId;
+use nostr::PublicKey;
+use nostr::RelayMessage;
+use nostr::Timestamp;
+use nostr_sdk::RelayPoolNotification;
+
+use crate::message::DephyDechargeMessage;
+use crate::message::DephyDechargeMessageRequestPayload;
+use crate::message::DephyDechargeMessageStatusPayload;
+use crate::message::DephyDechargeStatus;
+use crate::message::DephyDechargeStatusReason;
+use crate::relay_client::extract_mention;
+use crate::RelayClient;
+
+const PREPAID_AMOUNT: u64 = 10_000_000;
+
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("Serde json error: {0}")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Nostr key error: {0}")]
+    NostrKey(#[from] nostr::key::Error),
+    #[error("Relay client error: {0}")]
+    RelayClient(#[from] crate::relay_client::Error),
+    #[error("Machine not mentioned in event: {0:?}")]
+    MachineNotMentioned(Event),
+    #[error("The machine mentioned by event is not controlled by us: {0:?}")]
+    MachineNotControlled(Event),
+    #[error("Only support status event when update machine, but got: {0:?}")]
+    OnlySupportStatusEventWhenUpdateMachine(Event),
+}
+
+pub struct Machine {
+    #[allow(dead_code)]
+    pubkey: PublicKey,
+    status: DephyDechargeStatus,
+    initial_request: Option<EventId>,
+}
+
+pub struct MessageHandler {
+    client: RelayClient,
+    controller_pubkey: PublicKey,
+    admin_pubkey: PublicKey,
+    machines: HashMap<PublicKey, Machine>,
+    started_at: Timestamp,
+    solana_rpc_url: String,
+}
+
+impl MessageHandler {
+    pub fn new(
+        client: RelayClient,
+        controller_pubkey: PublicKey,
+        admin_pubkey: PublicKey,
+        machine_pubkeys: HashSet<PublicKey>,
+        solana_rpc_url: &str,
+    ) -> Self {
+        let started_at = Timestamp::now();
+        let machines = machine_pubkeys
+            .into_iter()
+            .map(|pubkey| {
+                (pubkey, Machine {
+                    pubkey,
+                    status: DephyDechargeStatus::Available,
+                    initial_request: None,
+                })
+            })
+            .collect();
+
+        Self {
+            client,
+            controller_pubkey,
+            admin_pubkey,
+            machines,
+            started_at,
+            solana_rpc_url: solana_rpc_url.to_string(),
+        }
+    }
+
+    pub async fn update_machine(&mut self, event: &Event) -> Result<(), Error> {
+        let mention = PublicKey::parse(
+            extract_mention(event).ok_or_else(|| Error::MachineNotMentioned(event.clone()))?,
+        )?;
+
+        let machine = self
+            .machines
+            .get_mut(&mention)
+            .ok_or_else(|| Error::MachineNotControlled(event.clone()))?;
+
+        let message = serde_json::from_str::<DephyDechargeMessage>(&event.content)?;
+
+        match message {
+            DephyDechargeMessage::Request { .. } => {
+                return Err(Error::OnlySupportStatusEventWhenUpdateMachine(
+                    event.clone(),
+                ))
+            }
+
+            DephyDechargeMessage::Status {
+                status,
+                initial_request,
+                ..
+            } => {
+                machine.status = status;
+                machine.initial_request = Some(initial_request);
+            }
+        }
+
+        Ok(())
+    }
+
+    pub async fn run(mut self) {
+        let mut notifications = self.client.notifications();
+
+        let checking_client = self.client.clone();
+        let relay_checker = async move {
+            checking_client
+                .run_relay_checker(std::time::Duration::from_secs(10))
+                .await
+        };
+
+        let message_handler = async move {
+            let mut sub_ids = HashMap::new();
+
+            for machine_pubkey in self.machines.keys().copied() {
+                let sub_id = self
+                    .client
+                    .subscribe_last_event(
+                        self.started_at,
+                        Some(&self.controller_pubkey),
+                        &machine_pubkey,
+                    )
+                    .await
+                    .expect("Failed to subscribe events");
+
+                sub_ids.insert(sub_id, machine_pubkey);
+            }
+
+            while !sub_ids.is_empty() {
+                let notification = notifications
+                    .recv()
+                    .await
+                    .expect("Failed to receive notification");
+                tracing::debug!("Received notification: {:?}", notification);
+
+                match notification {
+                    RelayPoolNotification::Shutdown => panic!("Relay pool shutdown"),
+
+                    RelayPoolNotification::Message {
+                        message:
+                            RelayMessage::Closed {
+                                message,
+                                subscription_id,
+                            },
+                        ..
+                    } => {
+                        if sub_ids.contains_key(&subscription_id) {
+                            tracing::error!(
+                                "Subscription closed before EndOfStoredEvents: {}",
+                                message
+                            );
+                            panic!("Subscription closed before EndOfStoredEvents: {message}");
+                        }
+                    }
+
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::EndOfStoredEvents(subscription_id),
+                        ..
+                    } => {
+                        sub_ids.remove(&subscription_id);
+                    }
+
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::Event { event, .. },
+                        ..
+                    } => {
+                        self.update_machine(&event)
+                            .await
+                            .expect("Failed to update machine");
+                    }
+
+                    _ => {}
+                }
+            }
+
+            let sub_id = self
+                .client
+                .subscribe(self.started_at, self.machines.keys().cloned())
+                .await
+                .expect("Failed to subscribe events");
+
+            loop {
+                let notification = notifications
+                    .recv()
+                    .await
+                    .expect("Failed to receive notification");
+                tracing::debug!("Received notification: {:?}", notification);
+
+                match notification {
+                    RelayPoolNotification::Shutdown => panic!("Relay pool shutdown"),
+
+                    RelayPoolNotification::Message {
+                        message:
+                            RelayMessage::Closed {
+                                message,
+                                subscription_id,
+                            },
+                        ..
+                    } if subscription_id == sub_id => {
+                        tracing::error!("Subscription closed: {}", message);
+                        panic!("Subscription closed: {message}");
+                    }
+
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::EndOfStoredEvents(subscription_id),
+                        ..
+                    } if subscription_id == sub_id => {}
+
+                    RelayPoolNotification::Message {
+                        message:
+                            RelayMessage::Event {
+                                event,
+                                subscription_id,
+                            },
+                        ..
+                    } if subscription_id == sub_id => {
+                        let Ok(message) =
+                            serde_json::from_str::<DephyDechargeMessage>(&event.content)
+                        else {
+                            tracing::error!("Failed to parse message: {:?}", event);
+                            continue;
+                        };
+
+                        self.handle_message(&event, &message)
+                            .await
+                            .expect("Failed to handle message");
+                    }
+
+                    _ => {}
+                }
+            }
+        };
+
+        futures::join!(relay_checker, message_handler);
+    }
+
+    async fn handle_message(
+        &mut self,
+        event: &Event,
+        message: &DephyDechargeMessage,
+    ) -> Result<(), Error> {
+        match message {
+            DephyDechargeMessage::Request {
+                to_status,
+                initial_request,
+                reason,
+                payload,
+            } => {
+                if event.pubkey != self.admin_pubkey
+                    && *reason != DephyDechargeStatusReason::UserRequest
+                {
+                    tracing::error!(
+                        "User can only use reason UserRequest, skip event: {:?}",
+                        event
+                    );
+                }
+
+                let Some(mention) = extract_mention(event) else {
+                    tracing::error!("Machine not mentioned in event, skip event: {:?}", event);
+                    return Ok(());
+                };
+
+                let Ok(machine_pubkey) = PublicKey::parse(mention) else {
+                    tracing::error!("Failed to parse machine pubkey, skip event: {:?}", mention);
+                    return Ok(());
+                };
+
+                let Some(machine) = self.machines.get(&machine_pubkey) else {
+                    tracing::error!("Machine not controlled by us, skip event: {:?}", mention);
+                    return Ok(());
+                };
+
+                if machine.status == *to_status {
+                    tracing::error!(
+                        "Machine already in requested status, skip event: {:?}",
+                        event
+                    );
+                    return Ok(());
+                }
+
+                if *to_status == DephyDechargeStatus::Available {
+                    if *reason == DephyDechargeStatusReason::UserRequest {
+                        tracing::error!(
+                            "User cannot manually stop machine, skip event: {:?}",
+                            event
+                        );
+                        return Ok(());
+                    }
+
+                    if let Some(ref original_request) = machine.initial_request {
+                        if original_request != initial_request {
+                            tracing::error!(
+                                "Machine already in working status with different request, skip event: {:?}",
+                                event
+                            );
+                            return Ok(());
+                        }
+                    }
+                }
+
+                let Ok(parsed_payload) =
+                    serde_json::from_str::<DephyDechargeMessageRequestPayload>(payload)
+                else {
+                    tracing::error!("Failed to parse payload, skip event: {:?}", payload);
+                    return Ok(());
+                };
+
+                match dephy_balance_payment_sdk::check_eligible(
+                    &self.solana_rpc_url,
+                    &parsed_payload.user,
+                    parsed_payload.nonce,
+                    PREPAID_AMOUNT,
+                    &parsed_payload.recover_info,
+                )
+                .await
+                {
+                    Err(e) => {
+                        tracing::error!(
+                            "Failed to check eligible, error: {:?} skip event: {:?}",
+                            e,
+                            event
+                        );
+                        return Ok(());
+                    }
+
+                    Ok(false) => {
+                        tracing::error!("User not eligible, skip event: {:?}", event);
+                        return Ok(());
+                    }
+                    Ok(true) => {}
+                }
+
+                self.client
+                    .send_event(mention, &DephyDechargeMessage::Status {
+                        status: *to_status,
+                        reason: *reason,
+                        initial_request: event.id,
+                        payload: serde_json::to_string(&DephyDechargeMessageStatusPayload {
+                            user: parsed_payload.user.clone(),
+                            nonce: parsed_payload.nonce,
+                            recover_info: parsed_payload.recover_info.clone(),
+                        })?,
+                    })
+                    .await?;
+
+                // TODO: Should check this by machine api
+                if *to_status == DephyDechargeStatus::Working {
+                    let client = self.client.clone();
+                    let mention = mention.to_string();
+                    let event_id = event.id;
+                    tokio::spawn(async move {
+                        tokio::time::sleep(std::time::Duration::from_secs(60)).await;
+                        client
+                            .send_event(&mention, &DephyDechargeMessage::Status {
+                                status: DephyDechargeStatus::Available,
+                                reason: DephyDechargeStatusReason::UserBehaviour,
+                                initial_request: event_id,
+                                payload: serde_json::to_string(
+                                    &DephyDechargeMessageStatusPayload {
+                                        user: parsed_payload.user.clone(),
+                                        nonce: parsed_payload.nonce,
+                                        recover_info: parsed_payload.recover_info,
+                                    },
+                                )
+                                .unwrap(),
+                            })
+                            .await
+                            .unwrap();
+                    });
+                }
+            }
+            DephyDechargeMessage::Status { .. } => self.update_machine(event).await?,
+        }
+        Ok(())
+    }
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/node/mod.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/node/mod.rs
new file mode 100644
index 0000000..e4ecd47
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/node/mod.rs
@@ -0,0 +1,3 @@
+mod message_handler;
+
+pub use message_handler::MessageHandler;
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/relay_client.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/relay_client.rs
new file mode 100644
index 0000000..de4b2b8
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/relay_client.rs
@@ -0,0 +1,182 @@
+use nostr::Event;
+use nostr::EventBuilder;
+use nostr::Filter;
+use nostr::Keys;
+use nostr::PublicKey;
+use nostr::SingleLetterTag;
+use nostr::SubscriptionId;
+use nostr::Tag;
+use nostr::Timestamp;
+use nostr_sdk::prelude::ReqExitPolicy;
+use nostr_sdk::Client;
+use nostr_sdk::RelayPoolNotification;
+use nostr_sdk::RelayStatus;
+use nostr_sdk::SubscribeAutoCloseOptions;
+use tokio::sync::broadcast::Receiver;
+
+const EVENT_KIND: nostr::Kind = nostr::Kind::Custom(1573);
+const MENTION_TAG: SingleLetterTag = SingleLetterTag::lowercase(nostr::Alphabet::P);
+const SESSION_TAG: SingleLetterTag = SingleLetterTag::lowercase(nostr::Alphabet::S);
+
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("Nostr client error: {0}")]
+    NostrClient(#[from] nostr_sdk::client::Error),
+    #[error("Serde json error: {0}")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Send event error: {0}")]
+    SendEvent(String),
+}
+
+#[derive(Clone)]
+pub struct RelayClient {
+    client: Client,
+    session: String,
+}
+
+impl RelayClient {
+    pub async fn new(
+        nostr_relay: &str,
+        keys: &Keys,
+        session: &str,
+        max_notification_size: usize,
+    ) -> Result<Self, Error> {
+        let client_opts =
+            nostr_sdk::Options::default().notification_channel_size(max_notification_size);
+
+        let client = Client::builder()
+            .signer(keys.clone())
+            .opts(client_opts)
+            .build();
+
+        client.add_relay(nostr_relay).await?;
+        client.connect().await;
+
+        Ok(Self {
+            client,
+            session: session.to_string(),
+        })
+    }
+
+    pub async fn run_relay_checker(self, interval: std::time::Duration) {
+        loop {
+            tokio::time::sleep(interval).await;
+
+            let connected_relay_count = self
+                .client
+                .relays()
+                .await
+                .values()
+                .filter(|relay| relay.status() == RelayStatus::Connected)
+                .count();
+
+            if connected_relay_count == 0 {
+                panic!("Lost connection to relay");
+            }
+        }
+    }
+
+    pub fn notifications(&self) -> Receiver<RelayPoolNotification> {
+        self.client.notifications()
+    }
+
+    pub async fn subscribe_last_event(
+        &self,
+        until: Timestamp,
+        author: Option<&PublicKey>,
+        mention: &PublicKey,
+    ) -> Result<SubscriptionId, Error> {
+        let mut filter = Filter::new();
+
+        filter = filter
+            .kind(EVENT_KIND)
+            .until(until)
+            .custom_tag(SESSION_TAG, [&self.session])
+            .custom_tag(MENTION_TAG, [mention.to_hex()])
+            .limit(1);
+
+        if let Some(author) = author {
+            filter = filter.author(*author)
+        }
+
+        let close_option =
+            SubscribeAutoCloseOptions::default().exit_policy(ReqExitPolicy::ExitOnEOSE);
+        let output = self
+            .client
+            .subscribe(vec![filter], Some(close_option))
+            .await?;
+
+        Ok(output.id().clone())
+    }
+
+    pub async fn subscribe<I>(
+        &self,
+        since: Timestamp,
+        mentions: I,
+    ) -> Result<SubscriptionId, Error>
+    where
+        I: IntoIterator<Item = PublicKey>,
+    {
+        let filter = Filter::new()
+            .kind(EVENT_KIND)
+            .since(since)
+            .custom_tag(SESSION_TAG, [&self.session])
+            .custom_tag(MENTION_TAG, mentions.into_iter().map(|pk| pk.to_hex()));
+
+        let output = self.client.subscribe(vec![filter], None).await?;
+
+        Ok(output.id().clone())
+    }
+
+    pub async fn subscribe_all(&self, since: Option<Timestamp>) -> Result<SubscriptionId, Error> {
+        let mut filter = Filter::new()
+            .kind(EVENT_KIND)
+            .custom_tag(SESSION_TAG, [&self.session]);
+
+        if let Some(since) = since {
+            filter = filter.since(since);
+        }
+
+        let output = self.client.subscribe(vec![filter], None).await?;
+
+        Ok(output.id().clone())
+    }
+
+    pub async fn send_event<M>(&self, to: &str, message: &M) -> Result<(), Error>
+    where M: serde::Serialize + std::fmt::Debug {
+        let content = serde_json::to_string(message)?;
+
+        let event_builder = EventBuilder::new(EVENT_KIND, content).tags([
+            Tag::parse(["s".to_string(), self.session.clone()]).unwrap(),
+            Tag::parse(["p".to_string(), to.to_string()]).unwrap(),
+        ]);
+
+        let res = self.client.send_event_builder(event_builder).await?;
+
+        if !res.failed.is_empty() {
+            for (relay_url, err) in res.failed.iter() {
+                tracing::error!("failed to send event to {} err: {:?}", relay_url, err);
+            }
+            return Err(Error::SendEvent(format!(
+                "Failed to send event {message:?} to relay"
+            )));
+        }
+
+        Ok(())
+    }
+}
+
+pub fn extract_mention(event: &Event) -> Option<&str> {
+    event
+        .tags
+        .iter()
+        .filter_map(|tag| {
+            if tag.single_letter_tag() == Some(MENTION_TAG) {
+                tag.content()
+            } else {
+                None
+            }
+        })
+        .next()
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/server/message_handler.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/server/message_handler.rs
new file mode 100644
index 0000000..0d87660
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/server/message_handler.rs
@@ -0,0 +1,254 @@
+use nostr::Event;
+use nostr::PublicKey;
+use nostr::RelayMessage;
+use nostr::Timestamp;
+use nostr_sdk::RelayPoolNotification;
+use tokio::sync::oneshot;
+
+use crate::message::DephyDechargeMessage;
+use crate::message::DephyDechargeMessageStatusPayload;
+use crate::message::DephyDechargeStatus;
+use crate::message::DephyDechargeStatusReason;
+use crate::relay_client::extract_mention;
+use crate::server::State;
+use crate::RelayClient;
+
+/// MAX_DEVIATION_SECONDS * 4
+/// MAX_DEVIATION_SECONDS is from dephy_messaging_network crate.
+const TIME_BACKTRACE_OF_INITIAL_RETRIEVE: std::time::Duration =
+    std::time::Duration::from_secs(30 * 4);
+
+const PREPAID_AMOUNT: u64 = 10_000_000;
+const TRANSFER_AMOUNT: u64 = 5_000_000;
+
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("IO error: {0}")]
+    Io(#[from] std::io::Error),
+    #[error("Server state error: {0}")]
+    State(#[from] crate::server::state::Error),
+    #[error("Serde json error: {0}")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Nostr key error: {0}")]
+    NostrKey(#[from] nostr::key::Error),
+    #[error("Relay client error: {0}")]
+    RelayClient(#[from] crate::relay_client::Error),
+}
+
+pub struct MessageHandler {
+    client: RelayClient,
+    state: State,
+    solana_rpc_url: String,
+    solana_keypair_path: String,
+    initial_notifier: Option<oneshot::Sender<()>>,
+}
+
+impl MessageHandler {
+    pub fn new(
+        client: RelayClient,
+        state: State,
+        solana_rpc_url: &str,
+        solana_keypair_path: &str,
+        initial_notifier: Option<oneshot::Sender<()>>,
+    ) -> Self {
+        Self {
+            client,
+            state,
+            solana_rpc_url: solana_rpc_url.to_string(),
+            solana_keypair_path: solana_keypair_path.to_string(),
+            initial_notifier,
+        }
+    }
+
+    pub async fn run(mut self) {
+        let last_processed_event = self
+            .state
+            .db_get_last_processed_event()
+            .await
+            .expect("Failed to get last processed event");
+
+        let since = last_processed_event.as_ref().map(|event| {
+            Timestamp::from_secs(event.created_at as u64) - TIME_BACKTRACE_OF_INITIAL_RETRIEVE
+        });
+        let last_event_id = last_processed_event.map(|event| event.event_id);
+
+        let mut notifications = self.client.notifications();
+        self.client
+            .subscribe_all(since)
+            .await
+            .expect("Failed to subscribe events");
+
+        let checking_client = self.client.clone();
+        let relay_checker = async move {
+            checking_client
+                .run_relay_checker(std::time::Duration::from_secs(10))
+                .await
+        };
+
+        let message_handler = async move {
+            let mut reached_last_event = last_event_id.is_none();
+
+            loop {
+                let notification = notifications
+                    .recv()
+                    .await
+                    .expect("Failed to receive notification");
+                tracing::debug!("Received notification: {:?}", notification);
+
+                match notification {
+                    RelayPoolNotification::Shutdown => panic!("Relay pool shutdown"),
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::Closed { message, .. },
+                        ..
+                    } => {
+                        tracing::error!("Subscription closed: {}", message);
+                        panic!("Subscription closed: {message}");
+                    }
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::EndOfStoredEvents { .. },
+                        ..
+                    } => {
+                        if !reached_last_event {
+                            tracing::error!(
+                                "Not reached last processed event: {last_event_id:?}, but received end of stored events"
+                            );
+                            panic!("Not reached last processed event");
+                        }
+
+                        tracing::info!("End of stored events, notifying the checker");
+
+                        let Some(notifier) = self.initial_notifier.take() else {
+                            tracing::info!("No initial_notifier found, will skip notifying");
+                            continue;
+                        };
+
+                        notifier.send(()).expect("Failed to notify checker start");
+                    }
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::Event { event, .. },
+                        ..
+                    } => {
+                        if !reached_last_event {
+                            let last_event_id = last_event_id.as_deref().unwrap();
+
+                            if event.id.to_hex() == last_event_id {
+                                tracing::info!(
+                                    "Reached last processed event: {last_event_id}, start handling events"
+                                );
+                                reached_last_event = true;
+                            }
+
+                            continue;
+                        }
+
+                        let Ok(message) =
+                            serde_json::from_str::<DephyDechargeMessage>(&event.content)
+                        else {
+                            tracing::error!("Failed to parse message: {:?}", event);
+                            continue;
+                        };
+
+                        self.handle_message(&event, &message)
+                            .await
+                            .expect("Failed to handle message");
+                    }
+                    _ => {}
+                }
+            }
+        };
+
+        futures::join!(relay_checker, message_handler);
+    }
+
+    async fn handle_message(
+        &self,
+        event: &Event,
+        message: &DephyDechargeMessage,
+    ) -> Result<(), Error> {
+        tracing::debug!("Handling message: {:?}", message);
+        let received_id = self
+            .state
+            .db_record_received_event(&event.id.to_hex(), event.created_at.as_u64() as i64)
+            .await?;
+
+        match message {
+            DephyDechargeMessage::Status {
+                status: DephyDechargeStatus::Working,
+                reason: DephyDechargeStatusReason::UserRequest,
+                initial_request,
+                payload,
+            } => {
+                let Some(mention) = extract_mention(event) else {
+                    tracing::error!("Machine not mentioned in event, skip event: {:?}", event);
+                    return Ok(());
+                };
+
+                if PublicKey::parse(mention).is_err() {
+                    tracing::error!("Failed to parse machine pubkey, skip event: {:?}", mention);
+                    return Ok(());
+                };
+
+                let parsed_payload =
+                    serde_json::from_str::<DephyDechargeMessageStatusPayload>(payload)?;
+
+                if let Err(e) = dephy_balance_payment_sdk::lock(
+                    &self.solana_rpc_url,
+                    &self.solana_keypair_path,
+                    &parsed_payload.user,
+                    PREPAID_AMOUNT,
+                    &parsed_payload.recover_info,
+                )
+                .await
+                {
+                    tracing::error!("Failed to lock error: {:?} event: {:?}", e, event);
+
+                    self.client
+                        .send_event(mention, &DephyDechargeMessage::Request {
+                            to_status: DephyDechargeStatus::Available,
+                            reason: DephyDechargeStatusReason::LockFailed,
+                            initial_request: *initial_request,
+                            payload: payload.to_string(),
+                        })
+                        .await?
+                }
+            }
+            DephyDechargeMessage::Status {
+                status: DephyDechargeStatus::Available,
+                reason: DephyDechargeStatusReason::UserBehaviour,
+                payload,
+                ..
+            } => {
+                let Some(mention) = extract_mention(event) else {
+                    tracing::error!("Machine not mentioned in event, skip event: {:?}", event);
+                    return Ok(());
+                };
+
+                if PublicKey::parse(mention).is_err() {
+                    tracing::error!("Failed to parse machine pubkey, skip event: {:?}", mention);
+                    return Ok(());
+                };
+
+                let parsed_payload =
+                    serde_json::from_str::<DephyDechargeMessageStatusPayload>(payload)?;
+
+                if let Err(e) = dephy_balance_payment_sdk::settle(
+                    &self.solana_rpc_url,
+                    &self.solana_keypair_path,
+                    &parsed_payload.user,
+                    parsed_payload.nonce,
+                    TRANSFER_AMOUNT,
+                )
+                .await
+                {
+                    tracing::error!("Failed to settle error: {:?} event: {:?}", e, event);
+                }
+            }
+            _ => {}
+        }
+
+        self.state.db_record_event_processed(received_id).await?;
+
+        Ok(())
+    }
+}
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/server/mod.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/server/mod.rs
new file mode 100644
index 0000000..ad1f7a3
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/server/mod.rs
@@ -0,0 +1,5 @@
+mod message_handler;
+mod state;
+
+pub use message_handler::MessageHandler;
+pub use state::State;
diff --git a/dephy-vending_machine-examples/examples/decharge-controller/src/server/state.rs b/dephy-vending_machine-examples/examples/decharge-controller/src/server/state.rs
new file mode 100644
index 0000000..ff4bb11
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/decharge-controller/src/server/state.rs
@@ -0,0 +1,123 @@
+use sea_query::Expr;
+use sea_query::Iden;
+use sea_query::Order;
+use sea_query::PostgresQueryBuilder;
+use sea_query::Query;
+use sea_query::SimpleExpr;
+use sea_query::Value;
+use sea_query_binder::SqlxBinder;
+use sea_query_binder::SqlxValues;
+
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("SQL build error: {0}")]
+    SqlBuild(#[from] sea_query::error::Error),
+    #[error("SQL execute error: {0}")]
+    SqlExecute(#[from] sqlx::Error),
+}
+
+#[derive(Iden, Clone, Copy)]
+enum ReceivedEvents {
+    Id,
+    Table,
+    EventId,
+    CreatedAt,
+    IsProcessed,
+}
+
+const RECEIVED_EVENT_RECORD_COLUMNS: [ReceivedEvents; 3] = [
+    ReceivedEvents::EventId,
+    ReceivedEvents::CreatedAt,
+    ReceivedEvents::IsProcessed,
+];
+#[derive(sqlx::FromRow, Debug)]
+pub struct ReceivedEventRecord {
+    pub event_id: String,
+    pub created_at: i64,
+    pub is_processed: bool,
+}
+
+pub struct State {
+    db: sqlx::PgPool,
+}
+
+impl State {
+    pub fn new(db: sqlx::PgPool) -> Self {
+        Self { db }
+    }
+
+    pub async fn db_get_last_processed_event(&self) -> Result<Option<ReceivedEventRecord>, Error> {
+        let (sql, values) = Query::select()
+            .columns(RECEIVED_EVENT_RECORD_COLUMNS)
+            .from(ReceivedEvents::Table)
+            .and_where(Expr::col(ReceivedEvents::IsProcessed).eq(true))
+            // Note: Should not use created_at for sorting.
+            // It is not unique and the messages may not be received in the order of creation.
+            .order_by(ReceivedEvents::Id, Order::Desc)
+            .limit(1)
+            .build_sqlx(PostgresQueryBuilder);
+
+        tracing::debug!("will execute: {sql} with {values:?}");
+
+        let row = sqlx::query_as_with::<_, ReceivedEventRecord, _>(&sql, values)
+            .fetch_optional(&self.db)
+            .await?;
+
+        Ok(row)
+    }
+
+    pub async fn db_record_received_event(
+        &self,
+        event_id: &str,
+        created_at: i64,
+    ) -> Result<i64, Error> {
+        let (sql, values) = Query::insert()
+            .into_table(ReceivedEvents::Table)
+            .columns([
+                ReceivedEvents::EventId,
+                ReceivedEvents::CreatedAt,
+                ReceivedEvents::IsProcessed,
+            ])
+            .values(
+                [
+                    Value::from(event_id),
+                    Value::from(created_at),
+                    Value::from(false),
+                ]
+                .map(SimpleExpr::Value),
+            )?
+            .returning(Query::returning().columns([ReceivedEvents::Id]))
+            .build_sqlx(PostgresQueryBuilder);
+
+        let row = sqlx::query_as_with::<_, (i64,), _>(&sql, values)
+            .fetch_one(&self.db)
+            .await?;
+
+        Ok(row.0)
+    }
+
+    // This method is isolated because updating the event to processed may be part of a transaction.
+    fn sql_received_event_is_processed(received_id: i64) -> (String, SqlxValues) {
+        let (sql, values) = Query::update()
+            .table(ReceivedEvents::Table)
+            .values([(
+                ReceivedEvents::IsProcessed,
+                SimpleExpr::Value(Value::from(true)),
+            )])
+            .and_where(Expr::col(ReceivedEvents::Id).eq(received_id))
+            .build_sqlx(PostgresQueryBuilder);
+        (sql, values)
+    }
+
+    pub async fn db_record_event_processed(&self, received_id: i64) -> Result<(), Error> {
+        let (received_sql, received_values) = State::sql_received_event_is_processed(received_id);
+        tracing::debug!("will execute: {received_sql} with {received_values:?}");
+
+        sqlx::query_with(&received_sql, received_values)
+            .execute(&self.db)
+            .await?;
+
+        Ok(())
+    }
+}
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/Cargo.toml b/dephy-vending_machine-examples/examples/gacha-controller/Cargo.toml
new file mode 100644
index 0000000..4252cea
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "dephy-gacha-controller"
+version = "0.1.0"
+edition = "2021"
+license.workspace = true
+
+[dependencies]
+clap = { workspace = true }
+dephy-balance-payment-sdk = { workspace = true }
+futures = { workspace = true }
+nostr = { workspace = true }
+nostr-sdk = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+tokio = { workspace = true, features = ["process", "rt-multi-thread"] }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true, features = ["env-filter"] }
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/README.md b/dephy-vending_machine-examples/examples/gacha-controller/README.md
new file mode 100644
index 0000000..df35ed2
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/README.md
@@ -0,0 +1,52 @@
+# dephy-gacha-controller
+
+## Prepare
+
+In this example, you should have a messaging network running on `ws://127.0.0.1:8000`.
+You can modify `--nostr-relay` if it is running on a different address.
+
+To run a messaging network you need a postgresql database with schema:
+
+```sql
+CREATE TABLE IF NOT EXISTS events (
+    id bigserial PRIMARY KEY,
+    event_id character varying NOT NULL,
+    prev_event_id character varying NOT NULL,
+    pubkey character varying NOT NULL,
+    created_at bigint NOT NULL,
+    original character varying NOT NULL,
+    "session" character varying NOT NULL,
+    mention character varying,
+
+    CONSTRAINT events_unique_event_id
+    UNIQUE (event_id),
+
+    CONSTRAINT events_unique_pubkey_session_prev_event_id
+    UNIQUE (pubkey, session, prev_event_id)
+);
+```
+
+To run a messaging network by docker:
+
+```shell
+docker run --name dephy-messaging-network --restart=always --network="host" -d dephyio/dephy-messaging-network:master serve --pg-url 'postgresql://<username>:<password>@<address>/<db>'
+```
+
+## Run Controller (this is on gacha equipment side)
+
+The controller daemon need your solana keypair.
+
+```shell
+mkdir data
+# copy your keypair to data/solana-keypair
+```
+
+```shell
+cargo run --bin dephy-gacha-controller -- --nostr-relay ws://127.0.0.1:8000 --machine-pubkeys 91550af28891a6ac6c73e0d415ed5ee9ea5603ef6d276df623a8b80254519ab2 --admin-pubkey <the pubkey of your private nostr key or use random one> --solana-rpc-url https://api.devnet.solana.com
+```
+
+## Cli Example (it simulates the process of inserting a coin)
+
+```shell
+cargo run --example cli -- --nostr-relay ws://127.0.0.1:8000 --machine-pubkey 91550af28891a6ac6c73e0d415ed5ee9ea5603ef6d276df623a8b80254519ab2 --user <user solana address> --nonce <nonce of recover info> --recover-info <recover info>
+```
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/examples/cli.rs b/dephy-vending_machine-examples/examples/gacha-controller/examples/cli.rs
new file mode 100644
index 0000000..77576c6
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/examples/cli.rs
@@ -0,0 +1,158 @@
+use std::path::PathBuf;
+
+use clap::value_parser;
+use clap::Arg;
+use clap::ArgAction;
+use clap::ArgMatches;
+use clap::Command;
+use dephy_gacha_controller::message::DephyGachaMessage;
+use dephy_gacha_controller::message::DephyGachaMessageRequestPayload;
+use dephy_gacha_controller::message::DephyGachaStatus;
+use dephy_gacha_controller::message::DephyGachaStatusReason;
+use nostr::Keys;
+use nostr::Timestamp;
+use nostr_sdk::EventId;
+
+const SESSION: &str = "dephy-gacha-controller";
+
+fn parse_args() -> Command {
+    Command::new("dephy-gacha-controller-cli")
+        .arg_required_else_help(true)
+        .about("Dephy gacha controller")
+        .version(dephy_gacha_controller::VERSION)
+        .arg(
+            Arg::new("NOSTR_RELAY")
+                .long("nostr-relay")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Nostr relay address"),
+        )
+        .arg(
+            Arg::new("KEY_FILE")
+                .long("key-file")
+                .num_args(1)
+                .default_value("data/key")
+                .value_parser(value_parser!(PathBuf))
+                .action(ArgAction::Set)
+                .help("Path to the file containing the hex or bech32 secret key"),
+        )
+        .arg(
+            Arg::new("MACHINE_PUBKEY")
+                .long("machine-pubkey")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Machine public keys, comma separated"),
+        )
+        .arg(
+            Arg::new("user")
+                .long("user")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("User public key"),
+        )
+        .arg(
+            Arg::new("nonce")
+                .long("nonce")
+                .num_args(1)
+                .required(true)
+                .value_parser(value_parser!(u64))
+                .action(ArgAction::Set)
+                .help("Nonce"),
+        )
+        .arg(
+            Arg::new("recover_info")
+                .long("recover-info")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Recover info"),
+        )
+}
+
+async fn cli(args: &ArgMatches) {
+    let nostr_relay = args.get_one::<String>("NOSTR_RELAY").unwrap();
+    let key_file_path = args.get_one::<PathBuf>("KEY_FILE").unwrap();
+    let keys = read_or_generate_keypair(key_file_path);
+    let machine_pubkey = args
+        .get_one::<String>("MACHINE_PUBKEY")
+        .unwrap()
+        .parse()
+        .expect("Invalid machine pubkey");
+    let user = args.get_one::<String>("user").unwrap();
+    let nonce = args.get_one::<u64>("nonce").unwrap();
+    let recover_info = args.get_one::<String>("recover_info").unwrap();
+
+    let client = dephy_gacha_controller::RelayClient::new(nostr_relay, &keys, SESSION, 4096)
+        .await
+        .expect("Failed to connect to relay");
+
+    let mut notifications = client.notifications();
+    client
+        .subscribe(Timestamp::now(), [machine_pubkey])
+        .await
+        .expect("Failed to subscribe");
+
+    let handler = tokio::spawn(async move {
+        loop {
+            let notification = notifications.recv().await;
+            tracing::info!("Received notification: {:?}", notification);
+        }
+    });
+
+    let payload = serde_json::to_string(&DephyGachaMessageRequestPayload {
+        user: user.clone(),
+        nonce: *nonce,
+        recover_info: recover_info.clone(),
+    })
+    .expect("Failed to serialize payload");
+
+    client
+        .send_event(&machine_pubkey.to_hex(), &DephyGachaMessage::Request {
+            to_status: DephyGachaStatus::Working,
+            reason: DephyGachaStatusReason::UserRequest,
+            initial_request: EventId::all_zeros(),
+            payload,
+        })
+        .await
+        .expect("Failed to send event");
+
+    handler.await.expect("Notification handler failed");
+}
+
+fn read_or_generate_keypair(path: &PathBuf) -> Keys {
+    let keys = std::fs::read_to_string(path)
+        .map(|content| content.trim().parse().expect("Invalid key"))
+        .unwrap_or_else(|_| {
+            tracing::info!(
+                "Key file not found, generating a new one at: {}",
+                path.display()
+            );
+            let keys = Keys::generate();
+            std::fs::write(path, keys.secret_key().to_secret_hex())
+                .unwrap_or_else(|e| panic!("Failed to write key {}: {e:?}", path.display()));
+            keys
+        });
+
+    let pubkey_path = path.with_extension("pub");
+    std::fs::write(&pubkey_path, keys.public_key().to_hex()).unwrap_or_else(|e| {
+        panic!(
+            "Failed to write public key {}: {e:?}",
+            pubkey_path.display()
+        )
+    });
+
+    keys
+}
+
+#[tokio::main]
+async fn main() {
+    let _ = tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .try_init();
+
+    let cmd = parse_args();
+    cli(&cmd.get_matches()).await;
+}
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/src/lib.rs b/dephy-vending_machine-examples/examples/gacha-controller/src/lib.rs
new file mode 100644
index 0000000..210058e
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/src/lib.rs
@@ -0,0 +1,8 @@
+pub mod message;
+pub mod node;
+mod relay_client;
+
+/// dephy-gacha-controller version
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");
+
+pub use relay_client::RelayClient;
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/src/main.rs b/dephy-vending_machine-examples/examples/gacha-controller/src/main.rs
new file mode 100644
index 0000000..47078d1
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/src/main.rs
@@ -0,0 +1,147 @@
+use std::path::PathBuf;
+
+use clap::value_parser;
+use clap::Arg;
+use clap::ArgAction;
+use clap::ArgMatches;
+use clap::Command;
+use nostr::Keys;
+
+const SESSION: &str = "dephy-gacha-controller";
+
+fn parse_args() -> Command {
+    Command::new("dephy-gacha-controller-node")
+        .arg_required_else_help(true)
+        .about("Dephy gacha controller node daemon")
+        .version(dephy_gacha_controller::VERSION)
+        .arg(
+            Arg::new("NOSTR_RELAY")
+                .long("nostr-relay")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Nostr relay address"),
+        )
+        .arg(
+            Arg::new("KEY_FILE")
+                .long("key-file")
+                .num_args(1)
+                .default_value("data/key")
+                .value_parser(value_parser!(PathBuf))
+                .action(ArgAction::Set)
+                .help("Path to the file containing the hex or bech32 secret key"),
+        )
+        .arg(
+            Arg::new("ADMIN_PUBKEY")
+                .long("admin-pubkey")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Admin public key"),
+        )
+        .arg(
+            Arg::new("MACHINE_PUBKEYS")
+                .long("machine-pubkeys")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Machine public keys, comma separated"),
+        )
+        .arg(
+            Arg::new("SOLANA_RPC_URL")
+                .long("solana-rpc-url")
+                .num_args(1)
+                .required(true)
+                .action(ArgAction::Set)
+                .help("Solana RPC URL"),
+        )
+        .arg(
+            Arg::new("SOLANA_KEYPAIR")
+                .long("solana-keypair")
+                .num_args(1)
+                .default_value("data/solana-keypair")
+                .value_parser(value_parser!(PathBuf))
+                .action(ArgAction::Set)
+                .help("Solana keypair path"),
+        )
+}
+
+async fn controller(args: &ArgMatches) {
+    let nostr_relay = args.get_one::<String>("NOSTR_RELAY").unwrap();
+    let key_file_path = args.get_one::<PathBuf>("KEY_FILE").unwrap();
+    let keys = read_or_generate_keypair(key_file_path);
+    let admin_pubkey = args
+        .get_one::<String>("ADMIN_PUBKEY")
+        .unwrap()
+        .parse()
+        .expect("Invalid admin pubkey");
+    let machine_pubkeys = args
+        .get_one::<String>("MACHINE_PUBKEYS")
+        .unwrap()
+        .split(',')
+        .map(|s| s.parse().expect("Invalid machine pubkey"))
+        .collect();
+    let solana_rpc_url = args.get_one::<String>("SOLANA_RPC_URL").unwrap();
+    let solana_keypair_path = args.get_one::<PathBuf>("SOLANA_KEYPAIR").unwrap();
+    if !solana_keypair_path.exists() {
+        panic!(
+            "Solana keypair file not found: {}",
+            solana_keypair_path.display()
+        );
+    }
+
+    println!("nostr relay: {}", nostr_relay);
+    println!("pubkey: {}", keys.public_key());
+
+    let client = dephy_gacha_controller::RelayClient::new(nostr_relay, &keys, SESSION, 4096)
+        .await
+        .expect("Failed to connect to relay");
+
+    let message_handler = dephy_gacha_controller::node::MessageHandler::new(
+        client,
+        solana_rpc_url,
+        solana_keypair_path
+            .to_str()
+            .expect("Invalid solana keypair path"),
+        keys.public_key(),
+        admin_pubkey,
+        machine_pubkeys,
+    );
+
+    message_handler.run().await
+}
+
+fn read_or_generate_keypair(path: &PathBuf) -> Keys {
+    let keys = std::fs::read_to_string(path)
+        .map(|content| content.trim().parse().expect("Invalid key"))
+        .unwrap_or_else(|_| {
+            tracing::info!(
+                "Key file not found, generating a new one at: {}",
+                path.display()
+            );
+            let keys = Keys::generate();
+            std::fs::write(path, keys.secret_key().to_secret_hex())
+                .unwrap_or_else(|e| panic!("Failed to write key {}: {e:?}", path.display()));
+            keys
+        });
+
+    let pubkey_path = path.with_extension("pub");
+    std::fs::write(&pubkey_path, keys.public_key().to_hex()).unwrap_or_else(|e| {
+        panic!(
+            "Failed to write public key {}: {e:?}",
+            pubkey_path.display()
+        )
+    });
+
+    keys
+}
+
+#[tokio::main]
+async fn main() {
+    let _ = tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .try_init();
+
+    let cmd = parse_args();
+    controller(&cmd.get_matches()).await;
+}
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/src/message.rs b/dephy-vending_machine-examples/examples/gacha-controller/src/message.rs
new file mode 100644
index 0000000..b8a7cd3
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/src/message.rs
@@ -0,0 +1,50 @@
+use nostr::EventId;
+use serde::Deserialize;
+use serde::Serialize;
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[repr(u8)]
+pub enum DephyGachaStatus {
+    Available = 1,
+    Working = 2,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
+#[repr(u8)]
+pub enum DephyGachaStatusReason {
+    UserRequest = 1,
+    AdminRequest = 2,
+    UserBehaviour = 3,
+    Reset = 4,
+    LockFailed = 5,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum DephyGachaMessage {
+    Request {
+        to_status: DephyGachaStatus,
+        reason: DephyGachaStatusReason,
+        initial_request: EventId,
+        payload: String,
+    },
+    Status {
+        status: DephyGachaStatus,
+        reason: DephyGachaStatusReason,
+        initial_request: EventId,
+        payload: String,
+    },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DephyGachaMessageRequestPayload {
+    pub user: String,
+    pub nonce: u64,
+    pub recover_info: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct DephyGachaMessageStatusPayload {
+    pub user: String,
+    pub nonce: u64,
+    pub recover_info: String,
+}
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/src/node/message_handler.rs b/dephy-vending_machine-examples/examples/gacha-controller/src/node/message_handler.rs
new file mode 100644
index 0000000..465ff06
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/src/node/message_handler.rs
@@ -0,0 +1,378 @@
+use std::collections::HashMap;
+use std::collections::HashSet;
+
+use nostr::Event;
+use nostr::EventId;
+use nostr::PublicKey;
+use nostr::RelayMessage;
+use nostr::Timestamp;
+use nostr_sdk::RelayPoolNotification;
+
+use crate::message::DephyGachaMessage;
+use crate::message::DephyGachaMessageRequestPayload;
+use crate::message::DephyGachaMessageStatusPayload;
+use crate::message::DephyGachaStatus;
+use crate::message::DephyGachaStatusReason;
+use crate::relay_client::extract_mention;
+use crate::RelayClient;
+
+const PAY_AMOUNT: u64 = 5_000_000;
+
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("Serde json error: {0}")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Nostr key error: {0}")]
+    NostrKey(#[from] nostr::key::Error),
+    #[error("Relay client error: {0}")]
+    RelayClient(#[from] crate::relay_client::Error),
+    #[error("Machine not mentioned in event: {0:?}")]
+    MachineNotMentioned(Event),
+    #[error("The machine mentioned by event is not controlled by us: {0:?}")]
+    MachineNotControlled(Event),
+    #[error("Only support status event when update machine, but got: {0:?}")]
+    OnlySupportStatusEventWhenUpdateMachine(Event),
+}
+
+pub struct Machine {
+    #[allow(dead_code)]
+    pubkey: PublicKey,
+    status: DephyGachaStatus,
+    initial_request: Option<EventId>,
+}
+
+pub struct MessageHandler {
+    client: RelayClient,
+    solana_rpc_url: String,
+    solana_keypair_path: String,
+    controller_pubkey: PublicKey,
+    admin_pubkey: PublicKey,
+    machines: HashMap<PublicKey, Machine>,
+    started_at: Timestamp,
+}
+
+impl MessageHandler {
+    pub fn new(
+        client: RelayClient,
+        solana_rpc_url: &str,
+        solana_keypair_path: &str,
+        controller_pubkey: PublicKey,
+        admin_pubkey: PublicKey,
+        machine_pubkeys: HashSet<PublicKey>,
+    ) -> Self {
+        let started_at = Timestamp::now();
+        let machines = machine_pubkeys
+            .into_iter()
+            .map(|pubkey| {
+                (pubkey, Machine {
+                    pubkey,
+                    status: DephyGachaStatus::Available,
+                    initial_request: None,
+                })
+            })
+            .collect();
+
+        Self {
+            client,
+            solana_rpc_url: solana_rpc_url.to_string(),
+            solana_keypair_path: solana_keypair_path.to_string(),
+            controller_pubkey,
+            admin_pubkey,
+            machines,
+            started_at,
+        }
+    }
+
+    pub async fn update_machine(&mut self, event: &Event) -> Result<(), Error> {
+        let mention = PublicKey::parse(
+            extract_mention(event).ok_or_else(|| Error::MachineNotMentioned(event.clone()))?,
+        )?;
+
+        let machine = self
+            .machines
+            .get_mut(&mention)
+            .ok_or_else(|| Error::MachineNotControlled(event.clone()))?;
+
+        let message = serde_json::from_str::<DephyGachaMessage>(&event.content)?;
+
+        match message {
+            DephyGachaMessage::Request { .. } => {
+                return Err(Error::OnlySupportStatusEventWhenUpdateMachine(
+                    event.clone(),
+                ))
+            }
+
+            DephyGachaMessage::Status {
+                status,
+                initial_request,
+                ..
+            } => {
+                machine.status = status;
+                machine.initial_request = Some(initial_request);
+            }
+        }
+
+        Ok(())
+    }
+
+    pub async fn run(mut self) {
+        let mut notifications = self.client.notifications();
+
+        let checking_client = self.client.clone();
+        let relay_checker = async move {
+            checking_client
+                .run_relay_checker(std::time::Duration::from_secs(10))
+                .await
+        };
+
+        let message_handler = async move {
+            let mut sub_ids = HashMap::new();
+
+            for machine_pubkey in self.machines.keys().copied() {
+                let sub_id = self
+                    .client
+                    .subscribe_last_event(
+                        self.started_at,
+                        Some(&self.controller_pubkey),
+                        &machine_pubkey,
+                    )
+                    .await
+                    .expect("Failed to subscribe events");
+
+                sub_ids.insert(sub_id, machine_pubkey);
+            }
+
+            while !sub_ids.is_empty() {
+                let notification = notifications
+                    .recv()
+                    .await
+                    .expect("Failed to receive notification");
+                tracing::debug!("Received notification: {:?}", notification);
+
+                match notification {
+                    RelayPoolNotification::Shutdown => panic!("Relay pool shutdown"),
+
+                    RelayPoolNotification::Message {
+                        message:
+                            RelayMessage::Closed {
+                                message,
+                                subscription_id,
+                            },
+                        ..
+                    } => {
+                        if sub_ids.contains_key(&subscription_id) {
+                            tracing::error!(
+                                "Subscription closed before EndOfStoredEvents: {}",
+                                message
+                            );
+                            panic!("Subscription closed before EndOfStoredEvents: {message}");
+                        }
+                    }
+
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::EndOfStoredEvents(subscription_id),
+                        ..
+                    } => {
+                        sub_ids.remove(&subscription_id);
+                    }
+
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::Event { event, .. },
+                        ..
+                    } => {
+                        self.update_machine(&event)
+                            .await
+                            .expect("Failed to update machine");
+                    }
+
+                    _ => {}
+                }
+            }
+
+            let sub_id = self
+                .client
+                .subscribe(self.started_at, self.machines.keys().cloned())
+                .await
+                .expect("Failed to subscribe events");
+
+            loop {
+                let notification = notifications
+                    .recv()
+                    .await
+                    .expect("Failed to receive notification");
+                tracing::debug!("Received notification: {:?}", notification);
+
+                match notification {
+                    RelayPoolNotification::Shutdown => panic!("Relay pool shutdown"),
+
+                    RelayPoolNotification::Message {
+                        message:
+                            RelayMessage::Closed {
+                                message,
+                                subscription_id,
+                            },
+                        ..
+                    } if subscription_id == sub_id => {
+                        tracing::error!("Subscription closed: {}", message);
+                        panic!("Subscription closed: {message}");
+                    }
+
+                    RelayPoolNotification::Message {
+                        message: RelayMessage::EndOfStoredEvents(subscription_id),
+                        ..
+                    } if subscription_id == sub_id => {}
+
+                    RelayPoolNotification::Message {
+                        message:
+                            RelayMessage::Event {
+                                event,
+                                subscription_id,
+                            },
+                        ..
+                    } if subscription_id == sub_id => {
+                        let Ok(message) = serde_json::from_str::<DephyGachaMessage>(&event.content)
+                        else {
+                            tracing::error!("Failed to parse message: {:?}", event);
+                            continue;
+                        };
+
+                        self.handle_message(&event, &message)
+                            .await
+                            .expect("Failed to handle message");
+                    }
+
+                    _ => {}
+                }
+            }
+        };
+
+        futures::join!(relay_checker, message_handler);
+    }
+
+    async fn handle_message(
+        &mut self,
+        event: &Event,
+        message: &DephyGachaMessage,
+    ) -> Result<(), Error> {
+        match message {
+            DephyGachaMessage::Request {
+                to_status,
+                initial_request,
+                reason,
+                payload,
+            } => {
+                if event.pubkey != self.admin_pubkey
+                    && *reason != DephyGachaStatusReason::UserRequest
+                {
+                    tracing::error!(
+                        "User can only use reason UserRequest, skip event: {:?}",
+                        event
+                    );
+                }
+
+                let Some(mention) = extract_mention(event) else {
+                    tracing::error!("Machine not mentioned in event, skip event: {:?}", event);
+                    return Ok(());
+                };
+
+                let Ok(machine_pubkey) = PublicKey::parse(mention) else {
+                    tracing::error!("Failed to parse machine pubkey, skip event: {:?}", mention);
+                    return Ok(());
+                };
+
+                let Some(machine) = self.machines.get(&machine_pubkey) else {
+                    tracing::error!("Machine not controlled by us, skip event: {:?}", mention);
+                    return Ok(());
+                };
+
+                if machine.status == *to_status {
+                    tracing::error!(
+                        "Machine already in requested status, skip event: {:?}",
+                        event
+                    );
+                    return Ok(());
+                }
+
+                if *to_status == DephyGachaStatus::Available {
+                    if *reason == DephyGachaStatusReason::UserRequest {
+                        tracing::error!(
+                            "User cannot manually stop machine, skip event: {:?}",
+                            event
+                        );
+                        return Ok(());
+                    }
+
+                    if let Some(ref original_request) = machine.initial_request {
+                        if original_request != initial_request {
+                            tracing::error!(
+                                "Machine already in working status with different request, skip event: {:?}",
+                                event
+                            );
+                            return Ok(());
+                        }
+                    }
+                }
+
+                let Ok(parsed_payload) =
+                    serde_json::from_str::<DephyGachaMessageRequestPayload>(payload)
+                else {
+                    tracing::error!("Failed to parse payload, skip event: {:?}", payload);
+                    return Ok(());
+                };
+
+                if let Err(e) = dephy_balance_payment_sdk::pay(
+                    &self.solana_rpc_url,
+                    &self.solana_keypair_path,
+                    &parsed_payload.user,
+                    PAY_AMOUNT,
+                    &parsed_payload.recover_info,
+                )
+                .await
+                {
+                    tracing::error!("Failed to pay, error: {:?} skip event: {:?}", e, event);
+                    return Ok(());
+                };
+
+                self.client
+                    .send_event(mention, &DephyGachaMessage::Status {
+                        status: *to_status,
+                        reason: *reason,
+                        initial_request: event.id,
+                        payload: serde_json::to_string(&DephyGachaMessageStatusPayload {
+                            user: parsed_payload.user.clone(),
+                            nonce: parsed_payload.nonce,
+                            recover_info: parsed_payload.recover_info.clone(),
+                        })?,
+                    })
+                    .await?;
+
+                // TODO: Should check this by machine api
+                if *to_status == DephyGachaStatus::Working {
+                    let client = self.client.clone();
+                    let mention = mention.to_string();
+                    let event_id = event.id;
+                    tokio::spawn(async move {
+                        tokio::time::sleep(std::time::Duration::from_secs(10)).await;
+                        client
+                            .send_event(&mention, &DephyGachaMessage::Status {
+                                status: DephyGachaStatus::Available,
+                                reason: DephyGachaStatusReason::UserBehaviour,
+                                initial_request: event_id,
+                                payload: serde_json::to_string(&DephyGachaMessageStatusPayload {
+                                    user: parsed_payload.user.clone(),
+                                    nonce: parsed_payload.nonce,
+                                    recover_info: parsed_payload.recover_info,
+                                })
+                                .unwrap(),
+                            })
+                            .await
+                            .unwrap();
+                    });
+                }
+            }
+            DephyGachaMessage::Status { .. } => self.update_machine(event).await?,
+        }
+        Ok(())
+    }
+}
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/src/node/mod.rs b/dephy-vending_machine-examples/examples/gacha-controller/src/node/mod.rs
new file mode 100644
index 0000000..e4ecd47
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/src/node/mod.rs
@@ -0,0 +1,3 @@
+mod message_handler;
+
+pub use message_handler::MessageHandler;
diff --git a/dephy-vending_machine-examples/examples/gacha-controller/src/relay_client.rs b/dephy-vending_machine-examples/examples/gacha-controller/src/relay_client.rs
new file mode 100644
index 0000000..de4b2b8
--- /dev/null
+++ b/dephy-vending_machine-examples/examples/gacha-controller/src/relay_client.rs
@@ -0,0 +1,182 @@
+use nostr::Event;
+use nostr::EventBuilder;
+use nostr::Filter;
+use nostr::Keys;
+use nostr::PublicKey;
+use nostr::SingleLetterTag;
+use nostr::SubscriptionId;
+use nostr::Tag;
+use nostr::Timestamp;
+use nostr_sdk::prelude::ReqExitPolicy;
+use nostr_sdk::Client;
+use nostr_sdk::RelayPoolNotification;
+use nostr_sdk::RelayStatus;
+use nostr_sdk::SubscribeAutoCloseOptions;
+use tokio::sync::broadcast::Receiver;
+
+const EVENT_KIND: nostr::Kind = nostr::Kind::Custom(1573);
+const MENTION_TAG: SingleLetterTag = SingleLetterTag::lowercase(nostr::Alphabet::P);
+const SESSION_TAG: SingleLetterTag = SingleLetterTag::lowercase(nostr::Alphabet::S);
+
+#[derive(Debug, thiserror::Error)]
+#[non_exhaustive]
+pub enum Error {
+    #[error("Nostr client error: {0}")]
+    NostrClient(#[from] nostr_sdk::client::Error),
+    #[error("Serde json error: {0}")]
+    SerdeJson(#[from] serde_json::Error),
+    #[error("Send event error: {0}")]
+    SendEvent(String),
+}
+
+#[derive(Clone)]
+pub struct RelayClient {
+    client: Client,
+    session: String,
+}
+
+impl RelayClient {
+    pub async fn new(
+        nostr_relay: &str,
+        keys: &Keys,
+        session: &str,
+        max_notification_size: usize,
+    ) -> Result<Self, Error> {
+        let client_opts =
+            nostr_sdk::Options::default().notification_channel_size(max_notification_size);
+
+        let client = Client::builder()
+            .signer(keys.clone())
+            .opts(client_opts)
+            .build();
+
+        client.add_relay(nostr_relay).await?;
+        client.connect().await;
+
+        Ok(Self {
+            client,
+            session: session.to_string(),
+        })
+    }
+
+    pub async fn run_relay_checker(self, interval: std::time::Duration) {
+        loop {
+            tokio::time::sleep(interval).await;
+
+            let connected_relay_count = self
+                .client
+                .relays()
+                .await
+                .values()
+                .filter(|relay| relay.status() == RelayStatus::Connected)
+                .count();
+
+            if connected_relay_count == 0 {
+                panic!("Lost connection to relay");
+            }
+        }
+    }
+
+    pub fn notifications(&self) -> Receiver<RelayPoolNotification> {
+        self.client.notifications()
+    }
+
+    pub async fn subscribe_last_event(
+        &self,
+        until: Timestamp,
+        author: Option<&PublicKey>,
+        mention: &PublicKey,
+    ) -> Result<SubscriptionId, Error> {
+        let mut filter = Filter::new();
+
+        filter = filter
+            .kind(EVENT_KIND)
+            .until(until)
+            .custom_tag(SESSION_TAG, [&self.session])
+            .custom_tag(MENTION_TAG, [mention.to_hex()])
+            .limit(1);
+
+        if let Some(author) = author {
+            filter = filter.author(*author)
+        }
+
+        let close_option =
+            SubscribeAutoCloseOptions::default().exit_policy(ReqExitPolicy::ExitOnEOSE);
+        let output = self
+            .client
+            .subscribe(vec![filter], Some(close_option))
+            .await?;
+
+        Ok(output.id().clone())
+    }
+
+    pub async fn subscribe<I>(
+        &self,
+        since: Timestamp,
+        mentions: I,
+    ) -> Result<SubscriptionId, Error>
+    where
+        I: IntoIterator<Item = PublicKey>,
+    {
+        let filter = Filter::new()
+            .kind(EVENT_KIND)
+            .since(since)
+            .custom_tag(SESSION_TAG, [&self.session])
+            .custom_tag(MENTION_TAG, mentions.into_iter().map(|pk| pk.to_hex()));
+
+        let output = self.client.subscribe(vec![filter], None).await?;
+
+        Ok(output.id().clone())
+    }
+
+    pub async fn subscribe_all(&self, since: Option<Timestamp>) -> Result<SubscriptionId, Error> {
+        let mut filter = Filter::new()
+            .kind(EVENT_KIND)
+            .custom_tag(SESSION_TAG, [&self.session]);
+
+        if let Some(since) = since {
+            filter = filter.since(since);
+        }
+
+        let output = self.client.subscribe(vec![filter], None).await?;
+
+        Ok(output.id().clone())
+    }
+
+    pub async fn send_event<M>(&self, to: &str, message: &M) -> Result<(), Error>
+    where M: serde::Serialize + std::fmt::Debug {
+        let content = serde_json::to_string(message)?;
+
+        let event_builder = EventBuilder::new(EVENT_KIND, content).tags([
+            Tag::parse(["s".to_string(), self.session.clone()]).unwrap(),
+            Tag::parse(["p".to_string(), to.to_string()]).unwrap(),
+        ]);
+
+        let res = self.client.send_event_builder(event_builder).await?;
+
+        if !res.failed.is_empty() {
+            for (relay_url, err) in res.failed.iter() {
+                tracing::error!("failed to send event to {} err: {:?}", relay_url, err);
+            }
+            return Err(Error::SendEvent(format!(
+                "Failed to send event {message:?} to relay"
+            )));
+        }
+
+        Ok(())
+    }
+}
+
+pub fn extract_mention(event: &Event) -> Option<&str> {
+    event
+        .tags
+        .iter()
+        .filter_map(|tag| {
+            if tag.single_letter_tag() == Some(MENTION_TAG) {
+                tag.content()
+            } else {
+                None
+            }
+        })
+        .next()
+}
diff --git a/dephy-vending_machine-examples/keypairs/bot.demo.json b/dephy-vending_machine-examples/keypairs/bot.demo.json
new file mode 100644
index 0000000..33396d4
--- /dev/null
+++ b/dephy-vending_machine-examples/keypairs/bot.demo.json
@@ -0,0 +1 @@
+[44,207,158,7,241,71,195,163,219,208,30,139,23,10,103,142,141,128,178,105,198,92,182,10,106,135,254,83,66,166,67,43,130,164,191,76,199,232,128,86,121,179,95,252,112,113,109,20,72,95,231,238,212,22,54,11,184,213,97,70,103,19,106,226]
diff --git a/dephy-vending_machine-examples/keypairs/user.demo.json b/dephy-vending_machine-examples/keypairs/user.demo.json
new file mode 100644
index 0000000..cbafc5b
--- /dev/null
+++ b/dephy-vending_machine-examples/keypairs/user.demo.json
@@ -0,0 +1 @@
+[217,84,19,12,238,222,160,44,140,57,205,228,164,72,186,127,152,217,218,235,201,22,54,234,187,138,129,167,83,9,87,177,196,67,202,217,204,23,61,11,118,126,77,248,143,227,5,39,3,26,126,6,67,228,190,144,149,109,173,251,108,74,221,200]
diff --git a/dephy-vending_machine-examples/rustfmt.toml b/dephy-vending_machine-examples/rustfmt.toml
new file mode 100644
index 0000000..cb1a6f9
--- /dev/null
+++ b/dephy-vending_machine-examples/rustfmt.toml
@@ -0,0 +1,13 @@
+edition = "2021"
+unstable_features = true
+tab_spaces = 4
+hard_tabs = false
+reorder_imports = true
+format_code_in_doc_comments = true
+wrap_comments = false
+format_strings = false
+imports_granularity = "Item"
+group_imports = "StdExternalCrate"
+where_single_line = true
+trailing_comma = "Vertical"
+overflow_delimited_expr = true
diff --git a/dephy-vending_machine-examples/taplo.toml b/dephy-vending_machine-examples/taplo.toml
new file mode 100644
index 0000000..f028e77
--- /dev/null
+++ b/dephy-vending_machine-examples/taplo.toml
@@ -0,0 +1,36 @@
+## https://taplo.tamasfe.dev/configuration/#configuration-file
+
+include = ["**/Cargo.toml"]
+
+[formatting]
+# Align consecutive entries vertically.
+align_entries = false
+# Append trailing commas for multi-line arrays.
+array_trailing_comma = true
+# Expand arrays to multiple lines that exceed the maximum column width.
+array_auto_expand = true
+# Collapse arrays that don't exceed the maximum column width and don't contain comments.
+array_auto_collapse = false
+# Omit white space padding from single-line arrays
+compact_arrays = true
+# Omit white space padding from the start and end of inline tables.
+compact_inline_tables = false
+# Maximum column width in characters, affects array expansion and collapse, this doesn't take whitespace into account.
+# Note that this is not set in stone, and works on a best-effort basis.
+column_width = 500
+# Indent based on tables and arrays of tables and their subtables, subtables out of order are not indented.
+indent_tables = false
+# The substring that is used for indentation, should be tabs or spaces (but technically can be anything).
+indent_string = '    '
+# Add trailing newline at the end of the file if not present.
+trailing_newline = true
+# Alphabetically reorder keys that are not separated by empty lines.
+reorder_keys = false
+# Maximum amount of allowed consecutive blank lines. This does not affect the whitespace at the end of the document, as it is always stripped.
+allowed_blank_lines = 1
+# Use CRLF for line endings.
+crlf = false
+
+[[rule]]
+keys = ["dependencies", "dev-dependencies", "build-dependencies", "workspace.dependencies"]
+formatting = { reorder_keys = true }
diff --git a/dephy-vending_machine-examples/typos.toml b/dephy-vending_machine-examples/typos.toml
new file mode 100644
index 0000000..2631f4c
--- /dev/null
+++ b/dephy-vending_machine-examples/typos.toml
@@ -0,0 +1,3 @@
+[default.extend-words]
+# skip `Ue`
+Ue = "Ue"